/usr/share/xscreensaver/config/xlyap.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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="xlyap" _label="XLyap">
<command arg="-root"/>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="10000"
convert="invert"/>
<number id="linger" type="slider" arg="-linger %"
_label="Linger" _low-label="Brief" _high-label="Long"
low="0" high="10" default="5" />
<!-- #### -builtin [-1] -->
<!-- #### -C [1] -->
<!-- #### -D [50] -->
<!-- #### -L -->
<!-- #### -M [1.0] -->
<!-- #### -O [0] -->
<!-- #### -R [] -->
<!-- #### -S [50] -->
<!-- #### -a [2.0] -->
<!-- #### -b [2.0] -->
<!-- #### -c [7] -->
<!-- #### -F [10101010] -->
<!-- #### -f [abbabaab] -->
<!-- #### -h [] -->
<!-- #### -i [0.65] -->
<!-- #### -m [] -->
<!-- #### -o [] -->
<!-- #### -p -->
<!-- #### -r [65000] -->
<!-- #### -s [256] -->
<!-- #### -v -->
<!-- #### -w [] -->
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<_description>
This generates pretty fractal pictures via the Lyapunov exponent.
http://en.wikipedia.org/wiki/Lyapunov_exponent
Written by Ron Record; 1997.
</_description>
</screensaver>
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