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/usr/share/osgearth/maps/readymap.earth is in osgearth-data 2.4.0+dfsg-6.

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The actual contents of the file can be viewed below.

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<!--
osgEarth Sample - ReadyMap.ORG Server - http://readymap.org

ReadyMap.ORG provides free global base map data for osgEarth developers!
This tiled, worldwide dataset of imagery, elevation, and street map data
is a great base map that provides global context for your own local datasets.
It works "out of the box" with osgEarth applications.

**** NOTICE ****
YOU ARE RESPONSIBLE for abiding by the TERMS AND CONDITIONS outlined at:
http://readymap.org

-->
<map name="readymap.org" type="geocentric" version="2">

    <image name="readymap_imagery" driver="tms">
        <url>http://readymap.org/readymap/tiles/1.0.0/7/</url>
        <color_filters>
            <gamma rgb="1.3"/>
        </color_filters>
    </image>
        
    <elevation name="readymap_elevation" driver="tms">
        <url>http://readymap.org/readymap/tiles/1.0.0/9/</url>
    </elevation>
    
    <options>
		<lighting>false</lighting>
		<elevation_tile_size>8</elevation_tile_size>
        <terrain normalize_edges="true" first_lod="1"/>
    </options>
    
</map>