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💧🌏 Greg CocksEdge Of Mars’ Great Dichotomy Eroded Back By Hundreds Of Kilometres -- <a href="https://arstechnica.com/science/2025/01/field-of-mounds-on-mars-may-be-sign-of-erosion-at-the-edge-of-an-ocean/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://arstechnica.com/science/2025/01/field-of-mounds-on-mars-may-be-sign-of-erosion-at-the-edge-of-an-ocean/</a> <-- shared technical article -- <a href="http://dx.doi.org/10.1038/s41561-024-01634-8" rel="nofollow noopener noreferrer" translate="no" target="_blank">http://dx.doi.org/10.1038/s41561-024-01634-8</a> <-- shared paper -- <a href="https://techhub.social/tags/GIS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#GIS</a> <a href="https://techhub.social/tags/spatial" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#spatial</a> <a href="https://techhub.social/tags/mapping" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#mapping</a> <a href="https://techhub.social/tags/planet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#planet</a> <a href="https://techhub.social/tags/Mars" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Mars</a> <a href="https://techhub.social/tags/remotesensing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#remotesensing</a> <a href="https://techhub.social/tags/imagery" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#imagery</a> <a href="https://techhub.social/tags/landsurface" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#landsurface</a> <a href="https://techhub.social/tags/geology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#geology</a> <a href="https://techhub.social/tags/topography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#topography</a> <a href="https://techhub.social/tags/astrogeology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#astrogeology</a> <a href="https://techhub.social/tags/elevation" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#elevation</a> <a href="https://techhub.social/tags/morphology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#morphology</a> <a href="https://techhub.social/tags/martian" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#martian</a> <a href="https://techhub.social/tags/geography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#geography</a> <a href="https://techhub.social/tags/marsdichotomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#marsdichotomy</a> <a href="https://techhub.social/tags/plateau" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#plateau</a> <a href="https://techhub.social/tags/lowlands" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#lowlands</a> <a href="https://techhub.social/tags/model" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#model</a> <a href="https://techhub.social/tags/3dmodel" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#3dmodel</a> <a href="https://techhub.social/tags/basin" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#basin</a> <a href="https://techhub.social/tags/highlands" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#highlands</a> <a href="https://techhub.social/tags/shoreline" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#shoreline</a> <a href="https://techhub.social/tags/ocean" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ocean</a> <a href="https://techhub.social/tags/crust" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#crust</a> <a href="https://techhub.social/tags/structuralgeology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#structuralgeology</a> <a href="https://techhub.social/tags/chemostratigraphy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#chemostratigraphy</a> <a href="https://techhub.social/tags/morphostratigraphy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#morphostratigraphy</a> <a href="https://techhub.social/tags/geomorphometry" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#geomorphometry</a> <a href="https://techhub.social/tags/geomorphology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#geomorphology</a> <a href="https://techhub.social/tags/water" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#water</a> <a href="https://techhub.social/tags/hydrology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hydrology</a> <a href="https://techhub.social/tags/CaSSIS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#CaSSIS</a> <a href="https://techhub.social/tags/HiRISE" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#HiRISE</a> <a href="https://techhub.social/tags/stratigraphy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#stratigraphy</a> <a href="https://techhub.social/tags/strata" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#strata</a> <a href="https://techhub.social/tags/MOLA" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MOLA</a> <a href="https://techhub.social/tags/laser" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#laser</a> <a href="https://techhub.social/tags/LiDAR" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#LiDAR</a> <a href="https://techhub.social/tags/MawrthVallis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MawrthVallis</a> <a href="https://techhub.social/tags/crater" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#crater</a> <a href="https://techhub.social/tags/mound" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#mound</a> <a href="https://techhub.social/tags/profile" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#profile</a> <a href="https://techhub.social/tags/crosssection" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#crosssection</a> <a href="https://techhub.social/tags/geochemistry" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#geochemistry</a> <a href="https://techhub.social/tags/mineralogy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#mineralogy</a> <a href="https://techhub.social/tags/CRISM" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#CRISM</a> <a href="https://techhub.social/tags/CTX" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#CTX</a> <a href="https://techhub.social/tags/HRSC" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#HRSC</a> <a href="https://techhub.social/tags/DTM" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#DTM</a> <a href="https://techhub.social/tags/erosion" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#erosion</a> <a href="https://techhub.social/tags/weathering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#weathering</a> <a href="https://techhub.social/tags/spatialanalysis" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#spatialanalysis</a> <a href="https://techhub.social/tags/spatiotemporal" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#spatiotemporal</a>

Sarah MilkovichMars global mosaic at 5.0 m/px! My friend Jay has been working on this for years (and the CTX/MRO operations team has been collecting the data for even longer)! Really delighted to poke around in this incredible dataset, open to everyone: <a href="https://murray-lab.caltech.edu/CTX/V01/SceneView/intro_c.html" rel="nofollow noopener noreferrer" target="_blank">https://murray-lab.caltech.edu/CTX/V01/SceneView/intro_c.html</a> <a href="https://wandering.shop/tags/Mars" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Mars</a> <a href="https://wandering.shop/tags/imaging" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#imaging</a> <a href="https://wandering.shop/tags/planetary" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#planetary</a> <a href="https://wandering.shop/tags/MRO" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MRO</a> <a href="https://wandering.shop/tags/CTX" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#CTX</a>

💧🌏 Greg CocksNew Interactive Mosaic Uses NASA Imagery To Show Mars In Vivid Detail -- <a href="https://murray-lab.caltech.edu/CTX/V01/SceneView/MurrayLabCTXmosaic.html" rel="nofollow noopener noreferrer" target="_blank">https://murray-lab.caltech.edu/CTX/V01/SceneView/MurrayLabCTXmosaic.html</a> <-- The Global CTX Mosaic of Mars online interactive map -- <a href="https://www.jpl.nasa.gov/news/new-interactive-mosaic-uses-nasa-imagery-to-show-mars-in-vivid-detail" rel="nofollow noopener noreferrer" target="_blank">https://www.jpl.nasa.gov/news/new-interactive-mosaic-uses-nasa-imagery-to-show-mars-in-vivid-detail</a> <-- JPL press release -- [since I am on a spatial Mars ‘kick’…] <a href="https://techhub.social/tags/GIS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#GIS</a> <a href="https://techhub.social/tags/spatial" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#spatial</a> <a href="https://techhub.social/tags/mapping" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#mapping</a> <a href="https://techhub.social/tags/Mars" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Mars</a> <a href="https://techhub.social/tags/remotesensing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#remotesensing</a> <a href="https://techhub.social/tags/water" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#water</a> <a href="https://techhub.social/tags/science" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#science</a> <a href="https://techhub.social/tags/highresolution" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#highresolution</a> <a href="https://techhub.social/tags/RedPlanet" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RedPlanet</a> <a href="https://techhub.social/tags/spaceprobe" class="mention hashtag" rel="nofollow 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href="https://techhub.social/tags/openaccess" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#openaccess</a> <a href="https://techhub.social/tags/ReconnaissanceOrbiter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ReconnaissanceOrbiter</a> <a href="https://techhub.social/tags/MRO" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MRO</a> <a href="https://techhub.social/tags/ContextCamera" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ContextCamera</a> <a href="https://techhub.social/tags/CTX" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#CTX</a> <a href="https://techhub.social/tags/HiRISE" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#HiRISE</a> <a href="https://techhub.social/tags/MARCI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MARCI</a> <a href="https://techhub.social/tags/GlobalSurveyor" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#GlobalSurveyor</a> <a href="https://techhub.social/tags/global" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#global</a> <a href="https://techhub.social/tags/image" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#image</a> <a href="https://techhub.social/tags/interactive" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#interactive</a> <a href="https://techhub.social/tags/online" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#online</a> <a href="https://techhub.social/tags/map" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#map</a> <a href="https://techhub.social/tags/water" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#water</a> <a href="https://techhub.social/tags/fluvial" class="mention 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rel="nofollow noopener noreferrer" target="_blank">#visualisation</a> <a href="https://techhub.social/tags/CalTech" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#CalTech</a> <a href="https://techhub.social/tags/JPL" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#JPL</a> <a href="https://techhub.social/tags/NASA" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#NASA</a>

💧🌏 Greg CocksSinuous Channels East Of Olympus Mons, Mars - Implications For Volcanic, Hydrological, And Tectonic Processes -- <a href="https://doi.org/10.1016/j.icarus.2021.114798" rel="nofollow noopener noreferrer" target="_blank">https://doi.org/10.1016/j.icarus.2021.114798</a> <-- paper - "HIGHLIGHTS: • [They] mapped channels and fossae within the volcanic plains east of Olympus Mons. • Late Amazonian channels east of Olympus Mons formed by eruptions of lava or water. • Fossae morphologies correspond to episodes of magmatic dike and sill emplacement. • Loading of Olympus Mons may control magmatic ascent processes and eruption types..." - <a href="https://techhub.social/tags/GIS" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#GIS</a> <a href="https://techhub.social/tags/spatial" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#spatial</a> <a href="https://techhub.social/tags/mapping" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#mapping</a> <a href="https://techhub.social/tags/volcanism" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#volcanism</a> <a href="https://techhub.social/tags/tectonics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#tectonics</a> <a href="https://techhub.social/tags/Mars" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Mars</a> <a href="https://techhub.social/tags/surface" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#surface</a> <a href="https://techhub.social/tags/interior" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#interior</a> <a href="https://techhub.social/tags/geologicalprocesses" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#geologicalprocesses</a> <a href="https://techhub.social/tags/remotesensing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#remotesensing</a> <a href="https://techhub.social/tags/map" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#map</a> <a href="https://techhub.social/tags/geology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#geology</a> <a href="https://techhub.social/tags/extraterrestrial" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#extraterrestrial</a> <a href="https://techhub.social/tags/OlympusMons" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#OlympusMons</a> <a href="https://techhub.social/tags/volcanic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#volcanic</a> <a href="https://techhub.social/tags/water" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#water</a> <a href="https://techhub.social/tags/hydrology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hydrology</a> <a href="https://techhub.social/tags/hydrospatial" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#hydrospatial</a> <a href="https://techhub.social/tags/lava" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#lava</a> <a href="https://techhub.social/tags/fossae" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#fossae</a> <a href="https://techhub.social/tags/morphology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#morphology</a> <a href="https://techhub.social/tags/geomorphology" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#geomorphology</a> <a href="https://techhub.social/tags/magma" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#magma</a> <a href="https://techhub.social/tags/dike" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#dike</a> <a href="https://techhub.social/tags/sill" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#sill</a> <a href="https://techhub.social/tags/eruption" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#eruption</a> <a href="https://techhub.social/tags/plains" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#plains</a> <a href="https://techhub.social/tags/traps" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#traps</a> <a href="https://techhub.social/tags/facies" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#facies</a> <a href="https://techhub.social/tags/map" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#map</a> <a href="https://techhub.social/tags/survey" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#survey</a> <a href="https://techhub.social/tags/fluvial" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#fluvial</a> <a href="https://techhub.social/tags/bedrock" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#bedrock</a> <a href="https://techhub.social/tags/erosion" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#erosion</a> <a href="https://techhub.social/tags/weathering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#weathering</a> <a href="https://techhub.social/tags/groundwater" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#groundwater</a> <a href="https://techhub.social/tags/surfacewater" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#surfacewater</a> <a href="https://techhub.social/tags/regolith" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#regolith</a> <a href="https://techhub.social/tags/lahar" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#lahar</a> <a href="https://techhub.social/tags/meltwater" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#meltwater</a> <a href="https://techhub.social/tags/snow" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#snow</a> <a href="https://techhub.social/tags/ice" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ice</a> <a href="https://techhub.social/tags/isostatic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#isostatic</a> <a href="https://techhub.social/tags/HiRISE" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#HiRISE</a> <a href="https://techhub.social/tags/CTX" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#CTX</a> <a href="https://techhub.social/tags/imagery" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#imagery</a> <a href="https://techhub.social/tags/chronostratigraphic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#chronostratigraphic</a> <a href="https://techhub.social/tags/model" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#model</a> <a href="https://techhub.social/tags/modeling" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#modeling</a> <a href="https://techhub.social/tags/gischat" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#gischat</a>

claudehi <a href="https://mastodon.xyz/@pippin" class="u-url mention" rel="nofollow noopener noreferrer" target="_blank">@pippin</a> (and anyone else who can answer - is there a better place for this kind of question? mailing list? forum?)I'm trying to use ctx.graphics to replace Cairo for speed reasons (want to render video), but I'm getting bad rendering (sometimes (not always) huge circles instead of small arcs). probably I'm doing something wrong here in my simple Cairo compatibility layer?``` <a href="https://post.lurk.org/tags/ifdef" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ifdef</a> USE_CTX ... <a href="https://post.lurk.org/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> ARC(cr,x,y,r,a0,a1) ctx_arc(cr,x,y,r,a0,a1,1) <a href="https://post.lurk.org/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> ARC_NEGATIVE(cr,x,y,r,a0,a1) ctx_arc(cr,x,y,r,a0,a1,-1)<a href="https://post.lurk.org/tags/else" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#else</a> // USE_CAIRO ... <a href="https://post.lurk.org/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> ARC cairo_arc <a href="https://post.lurk.org/tags/define" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#define</a> ARC_NEGATIVE cairo_arc_negative<a href="https://post.lurk.org/tags/endif" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#endif</a> ```here's the output of the project using Cairo, it fills lots of long thin "rectangles" with curved edges (stereographically projected from a sphere): <a href="https://mathr.co.uk/web/haystack-situations.html" rel="nofollow noopener noreferrer" target="_blank">https://mathr.co.uk/web/haystack-situations.html</a>I can publish my full source code repository if a complete (albeit non-minimal) example would be helpful.<a href="https://post.lurk.org/tags/cairo" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#cairo</a> <a href="https://post.lurk.org/tags/ctx" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#ctx</a> <a href="https://post.lurk.org/tags/graphics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#graphics</a>

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