benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 hvx4, 2001-09-14,  CWW ,   ,  ASHTECH,  02270 ,  Z-XII3 CC00,  ASH701945B_M,  CR519992603,  NONE, 1.4367, 1.4838, 30, 14570
 hvx4 HV-4_agency_unknown, 2006-09-15,  CMH ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.3703, 1.4179, 30, 16150
 hvx4 HV-4_agency_unknown, 2006-09-20,  BW_ ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031615,  NONE, 1.2329, 1.2819, 30, 1620
 hvx4 HV-4_agency_unknown, 2010-09-19,  CHS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH701945B_M,  CR519993703,  NONE, 1.3541, 1.4019, 15, 171930
 hvx4 HV-4_agency_unknown, 2010-09-20,  CHS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH701945B_M,  CR519993703,  NONE, 1.4267, 1.4739, 15, 15945