benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 esex, 2001-09-18,  GB ,  USGS ,  TRIMBLE,  3608A14594 ,  4000SSI NP,  TRM29659.00,  0220073541,  NONE, 1.4862, 0, 0, 21330
 esex, 2001-09-24,  WRT ,   ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH700936D_M,  CR14330,  NONE, 1.5546, 1.6008, 30, 410
 esex Esex_USGS_NEHRP, 2006-09-14,  GDH ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE21,  ASH701945B_M,  CR619992801,  NONE, 0.6086, 0.6708, 30, 18430
 esex Esex_USGS_NEHRP, 2006-09-15,  GDH ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE21,  ASH701945B_M,  CR619992801,  NONE, 0.6086, 0.6708, 30, 0
 esex Esex_USGS_NEHRP, 2006-09-16,  GDH ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE21,  ASH701945B_M,  CR619992801,  NONE, 0.6086, 0.6708, 30, 0