Fix error spotted by AWI which caused example 27 to fail with the xfig  driver. Cause was a short overflowing due to the large number of lines  in this example.
Fix error spotted by AWI which caused example 27 to fail with the xfig 
driver. Cause was a short overflowing due to the large number of lines 
in this example.


svn path=/trunk/; revision=9112

FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot,FreeScienceCommunity/PLPlot