/usr/share/xscreensaver/config/julia.xml is in xscreensaver-data-extra 5.36-1ubuntu1.
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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="julia" _label="Julia">
<command arg="-root"/>
<video href="https://www.youtube.com/watch?v=cA4Rgq-rmy8"/>
<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="count" type="slider" arg="-count %"
_label="Count" _low-label="Few" _high-label="Lots"
low="10" high="20000" default="1000"/>
<number id="cycles" type="slider" arg="-cycles %"
_label="Iterations" _low-label="Small" _high-label="Large"
low="1" high="100" default="20"/>
<number id="ncolors" type="slider" arg="-ncolors %"
_label="Number of colors" _low-label="Two" _high-label="Many"
low="1" high="255" default="200"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<xscreensaver-updater />
<_description>
The Julia set is a close relative of the Mandelbrot set. The
small moving dot indicates the control point from which the rest of
the image was generated. See also the "Discrete" screen saver.
https://en.wikipedia.org/wiki/Julia_set
Written by Sean McCullough; 1997.
</_description>
</screensaver>
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