This file is indexed.

/usr/share/xscreensaver/config/glcells.xml is in xscreensaver-gl 5.15-2ubuntu1.

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="glcells" _label="GLCells">

  <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="20000"
            convert="invert"/>
    <number id="pause" type="slider" arg="-pause %"
            _label="Linger" _low-label="Short" _high-label="Long"
            low="0" high="400" default="50"/>
    <number id="maxcells" type="slider" arg="-maxcells %"
            _label="Max cells" _low-label="Few" _high-label="Many"
            low="50" high="5000" default="800"/>
    <number id="radius" type="slider" arg="-radius %"
            _label="Cell radius" _low-label="Small" _high-label="Huge"
            low="5" high="80" default="40"/>
    <select id="quality">
      <option id="q0" _label="Lowest sphere detail"  arg-set="-quality 0"/>
      <option id="q1" _label="Medium sphere detail"  arg-set="-quality 1"/>
      <option id="q2" _label="Normal sphere detail"  arg-set="-quality 2"/>
      <option id="q3" _label="More sphere detail"/>
      <option id="q4" _label="Highest sphere detail" arg-set="-quality 4"/>
    </select>
   </vgroup>
   <vgroup>
    <number id="minfood" type="slider" arg="-minfood %"
            _label="Min food" _low-label="Starve" _high-label="Gorge"
            low="0" high="100" default="5"/>
    <number id="maxfood" type="slider" arg="-maxfood %"
            _label="Max food" _low-label="Starve" _high-label="Gorge"
            low="10" high="100" default="20"/>
    <number id="divideage" type="slider" arg="-divideage %"
            _label="Cell division" _low-label="Quick" _high-label="Slow"
            low="1" high="100" default="20"/>
    <number id="mindist" type="slider" arg="-mindist %"
            _label="Min distance" _low-label="Small" _high-label="Large"
            low="1.0" high="3.0" default="1.4"/>
    <number id="seeds" type="slider" arg="-seeds %"
            _label="Seeds" _low-label="1" _high-label="15"
           low="1" high="15" default="1"/>
   </vgroup>
  </hgroup>

  <hgroup>
   <boolean id="keepold" _label="Keep dead cells" arg-set="-keepold"/>
   <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
   <boolean id="wireframe" _label="Wireframe" arg-set="-wireframe"/>
  </hgroup>

  <_description>
Cells growing, dividing and dying on your screen.

Written by Matthias Toussaint; 2007.
  </_description>
</screensaver>