Removing heave from Knudsen chirp with heave in SEG-Y header.

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 Step 1:   make envelope
mkenv 0012_2011_155_1053_100212_CHP4.0_RAW_021.sgy

output file is env-0012_2011_155_1053_100212_CHP4.0_RAW_021.sgy
mkenv is the standard script to make envelopes.

Before heave removal
Plot using script uw1.

With "Knudsen" heave removal
(requires SIOSEIS ver 2011.2.14 (6 June 2011) or later)
Plot using script uw2.
 

With SIOSEIS heave removal
Plot using script uw3.