Binary gain recovered code: 1 = Yes 2 = No.

Same for original field recording.

Fixed trace length flag 1: All traces in this SEG Y file are guaranteed to have the same sample interval and number of samples, as specified in hdt and hns.

CDP fold expected per CDP ensemble.

data sample format code: 0 = Fixed point (1 bytes) 1 = Floating point (4 bytes) 2 = Fixed point (4 bytes) 3 = Fixed point (2 bytes) 4 = Fixed point w/ gain code (4 bytes) 5 = Floating point IEEE (4 bytes) 6 = Signed integer (1 byte) 7 = Not currently used 8 = Two's complement integer (1 byte)

SEG Y Format Revision Number, 0x0100 for revision 1.0.

Correlated data traces code: 1 = No 2 = Yes.

Sample interval in micro secs for this reel.

Number of samples per trace for this reel.

Sweep frequency at end.

Sweep frequency at start.

Sweep length (ms)

Sweep trace taper length at end (the ending taper starts at sweep length minus the taper length at end)

Sweep trace taper length at start if tapered (the taper starts at zero time and is effective for this length)

Sweep type code: 1 = Linear 2 = Parabolic 3 = Exponential 4 = Other.

Sweep trace taper type code: 1 = Linear 2 = Cos-squared 3 = Other.

Unassigned.

Unassigned.

Job identification number.

Line number (only one line per reel)

Measurement system code: 1 = Meters 2 = Feet.

Number of auxiliary traces per record.

Same for original field recording.

Number of data traces per record.

Number of 3200-byte Textual Header Extension records following the Binary Header.

Impulse signal polarity code: 1 = Increase in pressure or upward geophone case movement gives negative number on tape 2 = Increase in pressure or upward geophone case movement gives positive number on tape.

Amplitude recovery method code: 1 = None 2 = Spherical divergence 3 = AGC 4 = Other.

Reel number.

Trace number of sweep channel.

Trace sorting code: -1 = Other 0 = Unknown 1 = As recorded (no sorting) 2 = CDP ensemble 3 = Single fold continuous profile 4 = Horizontally stacked 5 = Common source 6 = Common receiver 7 = Common offset 8 = Common mid-point.

Vibratory polarity code:

Vertical sum code: 1 = No sum 2 = Two sum...