question about LINEAR definition

[Dan Leins]

When looking at the definition of how to use the LINEAR
option...specifically the increment section...

*increment* -- the spacing between grid values in the Y direction. It is
assumed that the Y dimension values go from south to north. Specified as a
positive floating point value. Used only for *LINEAR* mapping.

What exactly is the "spacing" measured in....kilometers?  Thinking it was
measured in kilometers, and knowing that I'm mapping 5km data, I tried
setting the increment to 5, however what I got was FAR from desirable.

Thanks,
Dan
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