/usr/share/xscreensaver/config/fieldlines.xml is in rss-glx 0.9.1-5ubuntu2.
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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="fieldlines" _label="Fieldlines">
<command arg="-r"/>
<number id="01" type="spinbutton" arg="-i %"
_label="Ions" low="1" high="100" default="4"/>
<number id="02" type="spinbutton" arg="-s %"
_label="Step length along lines" low="1" high="100" default="15"/>
<number id="03" type="spinbutton" arg="-m %"
_label="Max number of steps" low="1" high="1000" default="100"/>
<number id="04" type="slider" arg="-w %"
_label="Line width" _low-label="Smaller" _high-label="Larger"
low="1" high="100" default="30"/>
<number id="05" type="slider" arg="-S %"
_label="Speed" _low-label="Slower" _high-label="Faster"
low="1" high="100" default="10"/>
<boolean id="06" _label="Constant line width" arg-set="-c"/>
<boolean id="07" _label="Electric" arg-set="-w"/>
<_description>
Simulation of the electric field lines between charged particles.
Written by Terry Welsh <mogumbo at totalmail.com>.
Ported to Linux by Tugrul Galatali - <http://rss-glx.sourceforge.net/>.
Config Files by Curtis Haas.
</_description>
</screensaver>
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