15.72.11  SIZE 

SIZE=n gives the approximate spacing between chars.  in tenths of an inch.
If n is negative hardware characters will be used when available.  If n is
positive  software  characters  will  be  used  if mode VECTOR=ON.  If not
specified the size is determined by the most recent title  command.   Once
this  parameter has been set, the character size remains the same unless a
BOTTOM,TOP,RIGHT,LEFT,X,Y,Z or SIZE option is used.  If not specified  the
angle is determined by the most recent title command.