Acknowledgments

Robert Clayton introduced the original parameter-fetching method. Jon Claerbout introduced history files. Stew Levin got pipes to work and brought the code to the high standard we have enjoyed since about 1983. (The preceding was borrowed with trivial modification from Claerbout (1991).) We want to express our gratitude to everyone who contributed to the development of SEPlib and made it possible for all of us to use this powerful set of data processing tools.

Thanks to Lin Zhang for installing Joe's Hawaii bug fixes at Stanford. Thanks to Dave, Martin, Steve, and Jon for putting up with occasional barrages of e-mail from 2400 miles away, and with the even more trying questions asked in person at their desks. Any errors in this paper can be attributed to the fact that the two co-authors have never met (and used only e-mail for communication).

The test data is courtesy of Bertram Nolte and L. Neil Frazer.