sfsegyread currently limits the number of trace header keys to 71. However, you can remap a non-standard header. For example,
will map the header value at 189-193 bytes to the “swdep” standard header.
Note that numeration starts at 0 at and that the number of bytes in the
headers (2 or 4) should match. You can test the output by running
codemore code
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