Remaining Factor Levels Files
Remaining Factor Levels files have a .rfl extension, show the levels for the
remaining factors for a particular plot, and are kept in the \Strategy\Contours
folder. You may view these files with a text editor. A Remaining Factor
Levels file is generated for each slice for each response when you create contour
plots. (There is a .rfl file associated with each .prd file, and thus with each
slice for each response.)