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I normalized the data (see earlier post). Readable? Got suggestions on how to improve?

I ditched rgplot and instead used Gruff (wraps RMagick which wraps ImageMagick). Installation is pretty straightforward. However, I faced a problem with installing ghostscript on my OS X box. Something in the portfile is broken or something. Anyway, you might need to comment the following lines in the ghostscript portfile (typically something like /opt/local/var/db/dports/sources/rsync.rsync.darwinports.org_dpupdate_dports/print/ghostscript/Portfile):

[...]

debc62758716a169df9f62e6ab2bc634 aj16.tar.Z md5
b24ac1b6966adf3a92edaae42eda662c ag14.tar.Z md5
f9cad1b32e56f65339da26266f568e97 ac15.tar.Z md5
a9d876f28dde1d4a0a6571eb0e281761 ak12.tar.Z md5

[...]

default_variants +aj16 +ag14 +ac15 +ak12