C
C   COMMON BLOCK AND DECLARATIONS FOR VARIABLE FORMAT HEADER
C
C   Used by functions NewHeader and OldHeader (version 2.0)
C
C   08/20/90 djc

      common /header/ ireclen,         ! BYTES PER RECORD
     .                nhead,           ! NUMBER OF HEADER LINES
     .                nsamp,           ! NUMBER OF SAMPLES PER RECORD
     .                nline,           ! NUMBER OF LINES IN IMAGE
     .                nbytesamp,       ! BYTES PER SAMPLE
     .                version,         ! PROCESSOR VERSION NUMBER
     .                datatype,        ! DATA TYPE
     .                projection,      ! SLANT/GROUND RANGE PROJECTION
     .                rspace,          ! RANGE PIXEL SPACING
     .                azspace,         ! AZIMUTH PIXEL SPACING
     .                ibytesoldhead,   ! BYTE OFFSET TO OLD HEADER
     .                ibytesuserhead,  ! BYTE OFFSET TO USER HEADER
     .                ibytesdata       ! BYTE OFFSET TO DATA

      integer ireclen
      integer nhead
      integer nsamp
      integer nline
      integer nbytesamp
      integer ibytesoldhead
      integer ibytesuserhead
      integer ibytesdata

      real version
      real rspace
      real azspace

      character*20 projection
      character*20 datatype