A SES file consists of a print area and a data area. Normally the buffer is narrowed to show only the print area. The print area is read-only except for special SES commands; it contains cell values formatted by printer functions. The data area records the formula and printer functions, etc.
Show print and data areas (widen).
Show only print area (ses-renarrow-buffer).
Recreate print area by reevaluating printer functions for all cells
(ses-reprint-all).