Syntax: mash (input FITS image) (output FITS spectrum) [rows=m,n] [cols=m,n] [-sum] [-mdn] Mash part of image. OPTIONS: rows=m,n : mash an average, sum, or median of rows m to n. cols=m,n : mash an average, sum, or median of columns m to n. -sum : plot a sum when using rows= or cols= . -mdn : plot a median when using rows= or cols= . (default is average)