Merged revisions 6827 via svnmerge from
https://matplotlib.svn.sf.net/svnroot/matplotlib/branches/v0_98_5_maint
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r6827 | mdboom | 2009-01-26 09:32:42 -0500 (Mon, 26 Jan 2009) | 2 lines
Make curves and NaNs play nice together
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