This file is indexed.

/usr/share/xscreensaver/config/slip.xml is in xscreensaver-data-extra 5.15-3ubuntu1.

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="slip" _label="Slip">

  <command arg="-root"/>

  <hgroup>
   <vgroup>
    <number id="delay" type="slider" arg="-delay %"
            _label="Frame rate" _low-label="Low" _high-label="High"
            low="0" high="100000" default="50000"
            convert="invert"/>

    <number id="count" type="slider" arg="-count %"
            _label="Count" _low-label="Few" _high-label="Many"
             low="0" high="100" default="35"/>
   </vgroup>

   <vgroup>
    <number id="cycles" type="slider" arg="-cycles %"
             _label="Timeout" _low-label="Small" _high-label="Large"
            low="0" high="100" default="50"/>

    <number id="ncolors" type="slider" arg="-ncolors %"
              _label="Number of colors" _low-label="Two" _high-label="Many"
              low="1" high="255" default="200"/>
   </vgroup>
  </hgroup>

  <xscreensaver-image />

  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <_description>
This throws some random bits on the screen, then sucks them
through a jet engine and spews them out the other side.  To avoid
turning the image completely to mush, every now and then it will it
interject some splashes of color into the scene, or go into a spin
cycle, or stretch the image like taffy.

Written by Scott Draves and Jamie Zawinski; 1997.
  </_description>
</screensaver>