benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 04mg Sta_04-MG_1993_CalTr, 2007-05-30,  CHS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE21,  ASH701945E_M,  CR520031626,  NONE, 1.3733, 1.4209, 30, 154330
 04mg Sta_04-MG_1993_CalTr, 2007-05-31,  CHS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE21,  ASH701945E_M,  CR520031626,  NONE, 1.4015, 1.4489, 30, 15110
 04mg HGN_CALIF_Sta_04-MG_, 2009-02-04,  CHS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE21,  ASH701945B_M,  CR619992805,  NONE, 1.5003, 1.5469, 30, 16290
 04mg HGN_CALIF_Sta_04-MG_, 2009-02-05,  CHS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE21,  ASH701945B_M,  CR619992805,  NONE, 1.3925, 1.44, 30, 162630