/usr/share/doc/ploticus/examples/tree1.htm is in ploticus 2.42-1.
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 | <html><h1>tree1</h1><img src="tree1.gif"><p>
<a href="gall.using.html">How to download and try this example</a><br>
<p>
<a href="../gallery/ycase.newick">here's a link to ycase.newick</a>
<p>
<pre><b>Usage: pl -gif tree1.htm
<hr></b>
// yrange is one unit per tree leaf
// xrange depends on the distance values in your newick file
#proc areadef
rectangle: 1 1 5 5
xrange: 0 1.5
yrange: 0 18
#proc tree
newickfile: ycase.newick
// squaredoff: no
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