/usr/share/xscreensaver/config/julia.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 28 29 30 31 32 33 34 35 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="julia" _label="Julia">
<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="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"/>
<_description>
Animates the Julia set (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.
http://en.wikipedia.org/wiki/Julia_set
Written by Sean McCullough; 1997.
</_description>
</screensaver>
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