Variable: ses-box-prop
ses-box-prop is a variable defined in ses.el.gz.
Value
(:box
(:line-width 2 :style released-button))
Documentation
Display properties to create a raised box for cells in the header line.
Source Code
;; Defined in /usr/src/emacs/lisp/ses.el.gz
(defconst ses-box-prop '(:box (:line-width 2 :style released-button))
"Display properties to create a raised box for cells in the header line.")