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Plotting values in a map.

Hi all.

I'm an absolute begginer in IDL an perhaps this is a very simple question...

I'm working with an 193x92 array and I'd like to plot the values point by
point in a map. I have been using contour, but in this case I need to plot
the points independently (I have values over the Ocean only). I'm thinking
in somethig similar (but better) to the POST command in surfer

Thanks in advance