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/usr/share/xscreensaver/config/discrete.xml is in xscreensaver-data-extra 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="discrete" _label="Discrete">

  <command arg="-root"/>

  <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="cycles" type="slider" arg="-cycles %"
           _label="Timeout" _low-label="Small" _high-label="Large"
          low="100" high="10000" default="2500"/>

  <number id="ncolors" type="slider" arg="-ncolors %"
            _label="Number of colors" _low-label="Two" _high-label="Many"
            low="1" high="255" default="100"/>

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

  <_description>
More "discrete map" systems, including new variants of Hopalong and
Julia, and a few others.  See also the "Hopalong" and "Julia" 
screen savers.

Written by Tim Auckland; 1998.
  </_description>
</screensaver>