*** First record
(4 byte integer) - byte size of record (4*N) (f77 header)
(4 byte float) .. value 1
(4 byte float) .. value 2
...
(4 byte float) .. value N N = number of grid points in the field
(4 byte integer) .. byte size of record (4*N) (f77 trailer)

**** Second record
(4 byte integer) - byte size of record (4*N) (f77 header)
(4 byte float) .. value 1
(4 byte float) .. value 2
...
(4 byte float) .. value N N = number of grid points in the field
(4 byte integer) .. byte size of record (4*N) (f77 trailer)