SUUNPACK2 - unpack segy trace data from shorts to floats

suunpack2 <packed_file >unpacked_file

suunpack2 is the approximate inverse of supack2


Credits:
CWP: Jack K. Cohen, Shuki Ronen, Brian Sumner

Revised: 7/4/95 Stewart A. Levin Mobil
Changed decoding to parallel 2 byte encoding of supack2

Caveats:
This program is for single site use with supack2. See the
supack2 header comments.

Notes:
ungpow and unscale are defined in segy.h
trid = SHORTPACK is defined in su.h and segy.h

Trace header fields accessed: ns, trid, ungpow, unscale
Trace header fields modified: trid, ungpow, unscale