! do not REAL*8 CONVERT this... it is for single precision TRGRAF control...
 
      REAL XMIN,XMAX,YMIN,YMAX
      LOGICAL LOGX,LOGY
      COMMON/PLOT1MMX/ XMIN,XMAX,YMIN,YMAX,LOGX,LOGY
 
! see also PLOT1MMXB -- same COMMON, different variable names!
