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To see how your plot looks like you can use the Draft Run button. This will produce the PostScript file a lot faster than the Run Plot button, because it uses coarser contouring. To see the plot click File > View plot in Ghostview. Every time you use the Draft Run button the PostScript file will be updated, so you can keep only need to refresh the Ghostview openapplication to see the changes.
Multiple plots
Plotting often involves the creation of several maps. Press the Multi Run button to display the dialog for creating multiple map files. Browse in the names of the savesets you want to run.