Blank no-data.</tt></font><br>
  <font size="-1"><tt>P=double(P);</tt></font><br>
  <font size="-1"><tt>P(P==255)=NaN;</tt></font><br>
  <font size="-1"><tt>P=(pin.Slope*P+pin.Intercept);&nbsp;&nbsp; %
log_10
of chla</tt></font><br>
  <br>
  <font size="-1"><tt>LT=lat(ilt+[0:ltlm-1]);LG=lon(ilg+[0:lglm-1]);</tt></font><br>
  <font size="-1"><tt>[Plg,Plt]=meshgrid(LG,LT);</tt></font><br>
  <br>
  <font size="-1"><tt>% Draw the map...</tt></font><br>
  <br>
  <font size="-1"><tt>clf;</tt></font><br>
  <font s