Parkfield mag6 recording.
Depth below surface and channels of SAFOD instruments string.


Depth ft        channels        pod

3596            10,11,12        26
3465            13,14,15        27
3334            16,17,18        28
3202            19,20,21        29
3071            22,23,24        30
2940            25,26,27        31
2809            28,29,30        32