This file is indexed.

/usr/share/xscreensaver/config/superquadrics.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="superquadrics" _label="Superquadrics" gl="yes">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="40000"
          convert="invert"/>

  <number id="spinspeed" type="slider" arg="-spinspeed %"
          _label="Spin speed" _low-label="Slow" _high-label="Fast"
          low="0.1" high="15.0" default="5.0"/>

  <number id="count" type="slider" arg="-count %"
           _label="Density" _low-label="Low" _high-label="High"
          low="0" high="100" default="25"/>

  <number id="cycles" type="slider" arg="-cycles %"
           _label="Duration" _low-label="Short" _high-label="Long"
          low="0" high="100" default="40"/>

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

  <xscreensaver-updater />

  <_description>
Morphing 3D shapes.

Written by Ed Mackey; 1987, 1997.
  </_description>
</screensaver>