This file is indexed.

/usr/share/xscreensaver/config/plasma.xml is in rss-glx 0.9.1-6ubuntu4.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="plasma" _label="Plasma">

  <command arg="-r"/>

  <number id="01" type="slider" arg="-z %"
          _label="Magnification" _low-label="Smaller" _high-label="Larger"
          low="1" high="100" default="10"/>

  <number id="02" type="slider" arg="-f %"
          _label="Focus" _low-label="Less" _high-label="More"
          low="1" high="100" default="30"/>

  <number id="03" type="slider" arg="-s %"
          _label="Speed" _low-label="Slower" _high-label="Faster"
          low="1" high="100" default="20"/>

  <number id="04" type="slider" arg="-R %"
          _label="Resolution" _low-label="Less" _high-label="More"
          low="1" high="100" default="25"/>

  <_description>
Colorful flowing plasma.

Written by Terry Welsh &lt;mogumbo at totalmail.com&gt;.
Ported to Linux by Tugrul Galatali - &lt;http://rss-glx.sourceforge.net/&gt;.
Config Files by Curtis Haas.
  </_description>
</screensaver>