/usr/lib/python3/dist-packages/pyregion/tests/data/test03_img.reg is in python3-pyregion 2.0-2ubuntu1.
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 | # Region file format: DS9 version 4.1
global color=green dashlist=8 3 width=1 font="helvetica 10 normal roman" select=1 highlite=1 dash=0 fixed=0 edit=1 move=1 delete=1 include=1 source=1
image
ellipse(785.88577,1797.7287,549.82619,89.161004,0)
box(1959.8391,683.21624,638.98721,267.48301,42.160426) # color=white
polygon(2736.2827,1458.4216,2779.6249,1829.9257,2983.9522,1458.4216,3400.5806,1340.7403,2983.9522,1210.7521,2815.3277,1176.5112,2869.0754,1352.6843,2736.2827,1210.7521,2528.6732,1364.6282,2728.7342,1358.6562,2597.3509,1612.4649) # width=3
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