/etc/circos/tracks/highlight.bg.conf is in circos 0.69.6+dfsg-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 | fill_color = grey_a4
stroke_color = black_a4
stroke_thickness = 0
r1 = 1.2r
r0 = 0.2r
ideogram = 0
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