benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 0412 HPGN_CALIF_Sta_04-12, 2007-05-31,  JMS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE21,  ASH700936D_M,  CR14244,  NONE, 1.6242, 1.6699, 30, 15520
 0412 HPGN_CALIF_Sta_04-12, 2007-06-12,  CHS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE21,  ASH701945E_M,  CR520031622,  NONE, 1.4792, 1.526, 30, 152030
 0412 HPGN_CALIF_Sta_04-12, 2009-01-29,  CHS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE21,  ASH701945B_M,  CR619992805,  NONE, 1.5114, 1.5579, 30, 16120
 0412 HPGN_CALIF_Sta_04-12, 2009-02-03,  CHS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE21,  ASH701945B_M,  CR619992805,  NONE, 1.4711, 1.5179, 30, 16190
 0412 HPGN_CALIF_Sta_04-12, 2011-05-25,  CHS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE210,  ASH700936D_M,  CR14329,  NONE, 1.5346, 1.5809, 15, 15345
 0412 HPGN_CALIF_Sta_04-12, 2011-05-26,  CHS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE210,  ASH700936D_M,  CR14329,  NONE, 1.5618, 1.6079, 15, 145015
 0412 HPGN_CALIF_Sta_04-12, 2014-09-03,  JLS ,  USGS ,  JAVAD,  00620 ,  TRE_G3TH SIGMA3.3.1,  ASH701945E_M,  CR520031622,  NONE, 1.593, 1.6389, 15, 142915
 0412 HPGN_CALIF_Sta_04-12, 2014-09-10,  JLS ,  USGS ,  JAVAD,  00598 ,  TRE_G3TH SIGMA3.3.1,  ASH701945E_M,  CR620022601,  NONE, 1.2571, 1.3059, 15, 134845