COMMENT ⊗   VALID 00002 PAGES
C REC  PAGE   DESCRIPTION
C00001 00001
C00002 00002	  external  simple  procedure  sgreset
C00005 ENDMK
C⊗;
  external  simple  procedure  sgreset;
  external  simple  procedure  sgwtopen;
  external  simple  procedure  sgrdopen;
  external  simple  procedure  sgout;
  external  simple  procedure  sgclose;
  external  simple  procedure  sgin;
  external  simple  procedure  sginid(integer id);
  external  simple  procedure  sgdsplay;
  external  simple  procedure  sgdspinit;
  external  simple  procedure  wsghdr;
  external  simple  procedure  dspsg;
  external  simple  procedure  dspfew;
  external  simple  procedure  sgdspclose;
  external  simple  procedure  sgtty;
  external  boolean  procedure  sgoverlap(integer id1,id2);
  external  simple  procedure  filter;
  external  procedure  segzoom;
external  simple  procedure  segpicsize;
external  simple  real  procedure  seglen(integer id);
external  simple  integer  procedure  segfamily(integer segid);
external  simple  real  procedure  sdist(integer cid, t);
external  simple  procedure  sginto(integer id; reference
record!pointer (any!class) ptr);
external  simple  integer  procedure  noofsegs;
external  simple  procedure  segtofile(integer  chan);
external  simple  real  procedure  segangle(integer segid);
external  simple  procedure  get1s(reference  integer  r, c);
external  simple  procedure  get2s(reference  integer  r, c);
external  simple  procedure  getsgsize(reference integer r, c);
external  simple  procedure  sgdep(integer n,f,p,s,fk,r1,c1,r2,c2;
real l,t);
external  simple  procedure  depsg(integer s,r,c);