/usr/share/xscreensaver/config/cwaves.xml is in xscreensaver-data-extra 5.15-3ubuntu1.
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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="cwaves" _label="CWaves">
<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="waves" type="slider" arg="-waves %"
_label="Complexity" _low-label="Low" _high-label="High"
low="1" high="100" default="15"/>
<number id="ncolors" type="slider" arg="-colors %"
_label="Color transitions" _low-label="Rough" _high-label="Smooth"
low="2" high="1000" default="600"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<_description>
This generates a languidly-scrolling vertical field of sinusoidal colors.
Written by Jamie Zawinski; 2007.
</_description>
</screensaver>
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