Tweak ocaml version of example 21 to produce identical results to C version.
Tweak ocaml version of example 21 to produce identical results to C version.


svn path=/trunk/; revision=12156

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