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Display a bit map of specified format from a file_name or use the the active dataset when it is a bit map image.
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When Postscript plotting is active one can also display the active bit map (image) by dis [noref] or ima [noref]. In that case the image will also appear on the screen.
Just displaying the bit map from a file will assume it is not georeferenced. If it is, read it in as an active dataset first.
cross x_center y_center size
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