USGS CMG S-6-08-SC Magnetics

 S608SC   File s-6-08-sc.220_060 contains mag total, regional, 
 residual merged with GPS navigation.  Navigation refers to 
 the magnetic sensor (fish layback was applied in real-time).  
 Times are UTC - having been converted from the PDT times in 
 the source, s-6-09-sc.mag.csv.zip.
 
 This file should never be re-processed to recalculate the IGRF 
 because one will lose the time-variable correction.  The more 
 verbose s-6-09-sc.mag.csv.zip does contain all of the columns 
 that are of significance.
 
 Both this file and s-6-09-sc.220_060 were created from the 
 single s-6-09-sc.mag.csv.zip published in:
 
 Sliter, Ray W., Triezenberg, Peter J., Hart, Patrick E., 
 Watt, Janet T., Johnson, Samuel Y., and Scheirer, Daniel S., 
 2009, revised 2010, High-resolution seismic reflection and 
 marine magnetic data along the Hosgri Fault Zone, central 
 California: U.S. Geological Survey Open-File Report 2009-1100, 
 version 1.1 [http://pubs.usgs.gov/of/2009/1100/].
 
 To download s-6-09-sc.mag.csv.zip, use the data table in the 
 report at URL: 
 http://pubs.usgs.gov/of/2009/1100/data_tables.html.