/usr/share/xscreensaver/config/grav.xml is in xscreensaver-data-extra 5.36-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="grav" _label="Grav">
<command arg="-root"/>
<video href="https://www.youtube.com/watch?v=spQRFDmDMeg"/>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="10000"
convert="invert"/>
<number id="count" type="slider" arg="-count %"
_label="Number of objects" _low-label="Few" _high-label="Many"
low="1" high="40" default="12"/>
<number id="ncolors" type="slider" arg="-ncolors %"
_label="Number of colors" _low-label="Two" _high-label="Many"
low="1" high="255" default="64"/>
<hgroup>
<boolean id="decay" _label="Orbital decay" arg-unset="-no-decay"/>
<boolean id="trail" _label="Object trails" arg-unset="-no-trail"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
</hgroup>
<xscreensaver-updater />
<_description>
An orbital simulation. With trails enabled, it looks kind of like a
cloud-chamber photograph.
Written by Greg Bowering; 1997.
</_description>
</screensaver>
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