C
C     ***COMMON AREA HOLDING DATA DESCRIBING BLANKED AREAS
C     *** JOHN STEIERT     2-DEC-81
C
C          BLNKX1(4)        LEFT X-COORDINATES OF BLANK AREAS
C          BLNKX2(4)        RIGHT X-COORDINATES OF BLANK AREAS
C          BLNKY1(4)        LOWER Y-COORDINATE OF BLANK AREAS
C          BLNKY2(4)        UPPER Y-COORDINATE OF BLANK AREAS
C          BLNKON(4)        FLAGS TO SHOW BLANK AREAS IN OPERATION
C
      REAL BLNKX1(4), BLNKX2(4), BLNKY1(4), BLNKY2(4)
      LOGICAL BLNKON(4)
      COMMON /BLNK$D/ BLNKON, BLNKX1, BLNKX2, BLNKY1, BLNKY2