This file is indexed.

/usr/share/xscreensaver/config/gflux.xml is in xscreensaver-gl 5.30-1+deb8u2.

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="gflux" _label="GFlux" gl="yes">

  <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="wave" type="slider" arg="-speed %"
            _label="Wave speed" _low-label="Slow" _high-label="Fast"
            low="0" high="0.50" default="0.05"
            convert="invert"/>
   </vgroup>
   <vgroup>
    <number id="squares" type="slider" arg="-squares %"
             _label="Mesh density" _low-label="Sparse" _high-label="Dense"
            low="2" high="40" default="19"/>

    <number id="waves" type="slider" arg="-waves %"
            _label="Waves" _low-label="1" _high-label="10"
             low="1" high="10" default="3"/>
   </vgroup>
  </hgroup>

  <select id="mode">
   <option id="wire"    _label="Wire mesh"            arg-set="-mode wire"/>
   <option id="solid"   _label="Flat lighting"        arg-set="-mode solid"/>
   <option id="light"   _label="Directional lighting" arg-set="-mode light"/>
   <option id="checker" _label="Checkerboard"         arg-set="-mode checker"/>
   <option id="grab"    _label="Picture"              />
  </select>

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

  <!-- #### -resolution [4] -->
  <!-- #### -flat [0] -->
  <!-- #### -rotationx [0.01] -->
  <!-- #### -rotationy [0.0] -->
  <!-- #### -rotationz [0.1] -->
  <!-- #### -waveChange [50] -->
  <!-- #### -waveHeight [1.0] -->
  <!-- #### -waveFreq [3.0] -->
  <!-- #### -zoom [1.0] -->

  <xscreensaver-image />

  <xscreensaver-updater />

  <_description>
Undulating waves on a rotating grid.

Written by Josiah Pease; 2000.
  </_description>
</screensaver>