SURECIP - sum opposing offsets in prepared data (see below)

surecip <stdin >stdout

Sum traces with equal positive and negative offsets (i.e. assume reciprocity holds).

Usage:
suabshw <data >absdata
susort cdp offset <absdata | surecip >sumdata

Note that this processing stream can be simply evoked by:

recip data sumdata


Credits:
SEP: Shuki Ronen
CWP: Jack Cohen

Caveat:
The assumption is that this operation is not a mainstay processing item. Hence the recommended implemention via the 'recip' shell script. If it becomes a mainstay, then a much faster code can quickly drummed up by incorporating portions of suabshw and susort.

Trace header fields accessed: ns
Trace header fields modified: nhs, tracl, sx, gx