http://geophysics.eas.gatech.edu/people/jwalter/sacresponse.html
https://ds.iris.edu/files/sac-manual/commands/transfer.html
http://www.fdsn.org/seed_manual/SEEDManual_V2.4.pdf
http://geophysics.eas.gatech.edu/people/jwalter/sacresponse.html
https://ds.iris.edu/files/sac-manual/commands/transfer.html
http://www.fdsn.org/seed_manual/SEEDManual_V2.4.pdf