/usr/share/xscreensaver/config/interference.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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="interference" _label="Interference">
<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="30000"
convert="invert"/>
<number id="wspeed" type="slider" arg="-speed %"
_label="Wave speed" _low-label="Slow" _high-label="Fast"
low="1" high="100" default="30"/>
<number id="radius" type="slider" arg="-radius %"
_label="Wave size" _low-label="Small" _high-label="Large"
low="50" high="1500" default="800"/>
<number id="count" type="slider" arg="-count %"
_label="Number of waves" _low-label="Few" _high-label="Many"
low="0" high="20" default="3"/>
</vgroup>
<vgroup>
<number id="gridsize" type="slider" arg="-gridsize %"
_label="Magnification" _low-label="Low" _high-label="High"
low="1" high="20" default="4"/>
<number id="ncolors" type="slider" arg="-ncolors %"
_label="Number of colors" _low-label="Two" _high-label="Many"
low="1" high="255" default="128"/>
<number id="color_contrast" type="slider" arg="-color-shift %"
_label="Color contrast" _low-label="Low" _high-label="High"
low="0" high="100" default="60"/>
<number id="hue" type="slider" arg="-hue %"
_label="Hue" _low-label="0" _high-label="360"
low="0" high="360" default="0"/>
</vgroup>
</hgroup>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<_description>
Color field based on computing decaying sinusoidal waves.
Written by Hannu Mallat; 1998.
</_description>
</screensaver>
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