Certain options allow data (in relatively large quantities) to be “dumped” to external ascii files created by the program. For example row and column totals may be dumped in this way or the entire matrix cell by cell. Various “formats”, e.g. the style required by spreadsheets such as EXCEL, may be selected.
Generally speaking the output ascii files are assigned the extension .TXT by default. (Strictly this is the value set by the namelist parameter KPEXT in SAT10KEY.DAT; see Appendix Y, though if omitted from there, the program actually defaults to .KP). For subsequent inputs, the ascii files may need to be re-christened as .DAT files. Note, however, that the default value of KPEXT, and therefore the default extensions used within MX may be user-set in the Preferences File MX0.DAT.