+The SAVE subcommand causes PSPP to save the residuals or predicted
+values from the fitted
+model to the active file. PSPP will store the residuals in a variable
+called RES1 if no such variable exists, RES2 if RES1 already exists,
+RES3 if RES1 and RES2 already exist, etc. It will choose the name of
+the variable for the predicted values similarly, but with PRED as a
+prefix.
+