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Spatially smooth a data cube by the specified Gaussian OR to reach a given (circular) resolution. Major and Minor must be in the same units as that of the input cube axes (i.e. Radians for astronomical images). Smoothing is performed by an FFT-based convolution.
If only Major is given, and the input cube has a specified spatial resolution, MAP_CONVOLVE will attempt to provide a new spatial resolution of size Major. This requires that the initial major axis is smaller than Major.
In other cases, the input cube is smoothed by specified Gaussian.