SUDIPFILT - DIP--or better--SLOPE Filter in f-k domain

sudipfilt <infile >outfile [optional parameters]

Required Parameters:
dt=(from header) if not set in header then mandatory
dx=(from header, d1) if not set in header then mandatory

Optional parameters:
slopes=0.0 monotonically increasing slopes
amps=1.0 amplitudes corresponding to slopes
bias=0.0 slope made horizontal before filtering

verbose=0 verbose = 1 echoes information

tmpdir= if non-empty, use the value as a directory path
prefix for storing temporary files; else if the
the CWP_TMPDIR environment variable is set use
its value for the path; else use tmpfile()

Notes:
d2 is an acceptable alias for dx in the getpar

Slopes are defined by delta_t/delta_x, where delta
means change. Units of delta_t and delta_x are the same
as dt and dx. It is sometimes useful to fool the program
with dx=1 dt=1, thus avoiding units and small slope values.

Linear interpolation and constant extrapolation are used to
determine amplitudes for slopes that are not specified.
Linear moveout is removed before slope filtering to make
slopes equal to bias appear horizontal. This linear moveout
is restored after filtering. The bias parameter may be
useful for spatially aliased data. The slopes parameter is
compensated for bias, so you need not change slopes when you
change bias.


Credits:

CWP: Dave (algorithm--originally called slopef)
Jack (reformatting for SU)

Trace header fields accessed: ns, dt, d2