SUBROUTINE BLANKS(XLN,YLN)
        CALL BLNK1(-0.5,XLN+0.5,-0.5,-0.02,0)
        CALL BLNK2(-0.5,XLN+0.5,YLN+0.02,YLN+0.5,0)
        CALL BLNK3(-0.5,-0.02,-0.02,YLN+0.02,0)
        CALL BLNK4(XLN+0.02,XLN+0.5,-0.02,YLN+0.02,0)
        RETURN
        END