#define VERT(n) ((((n)+1)/3)*3)
#define VERT(n) (20 * (n))
#define EFFPS(p) ((p) >= 6 ? (p) : 6)
extern int used
[]; /* available registers */
extern int ps
; /* dflt init pt size */
extern int deltaps
; /* default change in ps */
extern int gsize
; /* global size */
extern int gfont
; /* global font */
extern int ft
; /* dflt font */
extern FILE *curfile
; /* current input file */
extern int ifile
; /* input file number */
extern int linect
; /* line number in current file */
extern int eqline
; /* line where eqn started */
extern int eqnreg
, eqnht
;
extern int lefteq
, righteq
;
extern int lastchar
; /* last character read by lex */
extern int markline
; /* 1 if this EQ/EN contains mark or lineup */