FSIZE Type: Adverb (scalar) Use: Used to estimate the size of files in Megabytes. Null value: 0 As output adverb, 0 => error. Verbs: SIZEFILE....Determine the data set file size or estimate the IMAGR workfile size Procedure: LINIMAGE....Build image cube from multi-IF data set. FSIZE is the size of the output FLATNed image in pixels.