Hi,

I've successfully plotted gridded data on a basemap "cyl" projection 
using pcolor:

 mp = Basemap(projection="cyl", resolution="l", llcrnrlon=0.0, 
urcrnrlon=30.0, llcrnrlat=-5.0, urcrnrlat=5.0)
 pc = mp.pcolor(X, Y, zvalsm, cmap=cm.jet)

However, if I simply I change the projection type to merc, adding 
appropriate lat_ts, I get the projection but the pcolor fails to plot on 
it:

 mp = Basemap(projection="merc", lat_ts=0.0, resolution="l", 
llcrnrlon=0.0, urcrnrlon=30.0, llcrnrlat=-5.0, urcrnrlat=5.0)'
 pc = mp.pcolor(X, Y, zvalsm, cmap=cm.jet)

Any ideas? I am using matplotlib 0.91.2 and basemap 0.9.9 on CentOS 4.0 
with Python 2.3.

Thanks,
Rich

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