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

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The actual contents of the file can be viewed below.

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<rules>
<rule>
importance = 100
condition  = _VALUE_ < 2000
show       = no
</rule>
<rule>
importance = 95
condition  = _VALUE_ < 6000
color      = vvlgrey
stroke_color = black
stroke_thickness = 1
</rule>
</rules>