Synopsis
		sftahgethw < in.rsf > out.rsf key= verbose=1

tah is the abbreviation of Trace And Header. Madagascar programs
that begin with sftah are a designed to:
1- read trace and headers from separate rsf files and write them to
standard output (ie sftahread)
2- filter programs that read and write standard input/output and
process the tah data (eg sftahnmo, sftahstack)
3- read tah data from standard input and write separate rsf files for
the trace and headers data (ie sftahwrite)

These programs allow Seismic Unix (su) like processing in Madagascar.
Some programs have su like names.

Some programs in this suite are sftahread, sftahgethw, ftahhdrmath,
and sftahwrite.

The sftahgethw program prints headers. List the headers you want to
print in the key parameter.
EXAMPLE:

sftahread \
verbose=1 \
input=npr3_gathers.rsf \
| sftahgethw \
verbose=0 \
key=sx,sy,gx,gy,offset \
>/dev/null

The headers are in the file npr3_gathers_hdr.rsf,
the headers parameter default. The headers are merged with the trace
amplitudes and the tah data sent down the pipe for sftahgethw. The
source and group coordinates and offset (sx,sy,gx,gy,offset) are
printed to STDERR. Traces are sent to STDOUT, which is directed to
/dev/null (the bit bucket).

PARAMETERS
string key= no default

list of header keys print. Look at the sfsegyread for a list
of header names.

Parameters
		strings key= [numkeys]   int verbose=1 flag to control amount of print 0 terse, 1 informative, 2 chatty, 3 debug

Used In
		DATA          marmousi2mp/modelproc stratton/fetchbooklet teapotdome/firstlook teapotdome/test-preprocessing