SUUNPACK1 - unpack segy trace data from chars to floats

suunpack1 <packed_file >unpacked_file

suunpack1 is the approximate inverse of supack1


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

Caveats:
This program is for single site use with supack1. See the
supack1 header comments.

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


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