GETGSFC first ftp's to GSFC and finds out which files are there that are in the time range requested. It then ftp's the files one at a time back to MIT. If requested (the default), it converts to bat format, and attempts to correct the summary tape. If type1 or type 2 are set to pls or mag, the summary tape is then filtered to produce a file with only the pls/mag files. If type? is 'save', the intermediate, unfiltered, files are saved, otherwise they are removed.