cnvkit
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Graph autoscale is broken in cnvkit scatter v0.9.5
When plotting homozygous deletions with large negative Z scores:
cnvkit.py scatter -o autoscale.png -c chr22:39378286-39388064 -s autoscale.cns autoscale.cnr
Graph gets distorted on its Z score axis:

Files to reproduce the bug: autoscale.zip
Thanks for letting me know. I'll see about handling this case better.
In the meantime, you can specify the y-axis lower limit with the --y-min option. You can also save the output file as PDF and edit the plot with a vector graphics editor like Inkscape.