/etc/circos/tracks/text.conf is in circos 0.64-1.
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 22 23 | label_font = default
label_size = 12
color = black
r0 = 0.85r
r1 = 0.95r
show_links = no
link_dims = 2p,4p,8p,4p,2p
link_thickness = 1p
link_color = red
padding = 0p
rpadding = 0p
label_snuggle = no
max_snuggle_distance = 1r
snuggle_sampling = 1
snuggle_tolerance = 0.25r
snuggle_refine = no
snuggle_link_overlap_test = no
snuggle_link_overlap_tolerance = 2p
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