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Read the "Single Dish" data set. It can be a Class table (.tab), or a 3-D data cube (.lmv order). The data set is available as the SINGLE image variable.
If it is a 3-D data cube, the SHORT image variable is also defined (the data area is shared with that of the SINGLE imager variable, but the Headers are separate). If it is a Class table, the SHORT image becomes undefined. It will be computed by commands UV_SHORT (see HELP UV_SHORT Step_1) or XY_SHORT.