This file is indexed.

/usr/share/osgearth/maps/vertical_datum.earth is in osgearth-data 2.5.0+dfsg-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<!--
osgEarth Sample - EGM96
This example shows how to request an EGM96 vertical datum. Since there's no
heightfield layer, you will see the raw EGM96 geoid.
-->

<map version="2">   
    
    <image driver="gdal">
        <url>/usr/share/osgearth/data/world.tif</url>
    </image>
    
    <options>
        <profile>
            <srs>epsg:4326</srs>
            <vdatum>egm96</vdatum>
        </profile>
        <terrain>
            <lighting>false</lighting>
        </terrain>
    </options>
</map>