les.
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    <a href="cellplot.html">CELLPLOT</a> on the sphere
     
    When plotting data on the sphere, there is an annoying wrap-around
    effect when the data crosses the dateline at longitude 180.  This
    leads to lines extending all the way across the plot.
 
    <a href="cellplot.html">CELLPLOT</a>(LONO,LON,LAT) where LONO is the value of a cutoff longitude
    uses LONO as the right-hand-edge of the plot, and LONO-360 as the 
