Use the min/max of the data returned from each algorithm,  instead of the max/min of the irregularly sampled data.
Use the min/max of the data returned from each algorithm,  instead of the max/min of the irregularly sampled data.

svn path=/trunk/; revision=4780

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