[R] WMF conversion

[Terry Therneau]

Could you save the original graphics as a pdf, and include the pdf in
Powerpoint?  
 
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Unfortunately, after placed in the PowerPoint and the PowerPoint is
converted to PDF via MS Office's built in conversion utility, the
resulting image have diagonal streaks across them from the y-axis down
to the x-axis.  The rest of the document is perfect, but the WMF images
now have streaks across them.  It looks like it may be caused, somehow,
by the dotted grid.