@example
'header: \e$B%X%C%@$NKvHx$K;XDj$7$?J8;zNs$rA^F~$7$^$9!#\e(B
+'header-top: \e$B%X%C%@$N@hF,$K;XDj$7$?J8;zNs$rA^F~$7$^$9!#\e(B
'header-file: \e$B%X%C%@$NKvHx$K;XDj$7$?%U%!%$%k$rA^F~$7$^$9!#\e(B
'x-face: \e$B;XDj$7$?%U%!%$%k$NFbMF$r;}$D\e(B @samp{X-Face:} \e$B%U%#!<%k%I$r\e(B
\e$BA^F~$7$^$9!#\e(B
@example
'header: Inserts the specified string at the bottom of the header.
+'header-top: Inserts the specified string at the top of the header.
'header-file: Inserts the specified file at the bottom of the header.
'x-face: Inserts @samp{X-Face:} field with the content of the specified file.
'top: Inserts the specified string at the top of the body.