This file is indexed.

/usr/share/doc/circos/examples/mmchain.conf is in circos 0.55-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<plot>
pre_increment_counter = mmchain:1
file  = exampledata/heatmap.mm.5e6.hs.__$CONF{counter}{mmchain}__.txt
show  = __$CONF{show_heatmaps}__
type  = heatmap
min   = 6000
max   = 50000
color = eval(join(",",map { sprintf("chr%d_a%d",__$CONF{counter}{mmchain}__,$_) } (5,4,3,2,1) ))
r0    = eval(sprintf("%fr",0.99-__$CONF{counter}{mmchain}__*.025-.02))
r1    = eval(sprintf("%fr",0.99-__$CONF{counter}{mmchain}__*.025))
<<include heatmap.rules.conf>>
</plot>