benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 z28x, 2001-09-12,  FFP ,   ,  ASHTECH,  lp019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14329,  NONE, 0.9925, 1.0447, 30, 145830
 z28x, 2001-09-16,  JMS ,   ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH700936D_M,  CR14333,  NONE, 1.2065, 1.2558, 30, 16390
 z28x Z28_1933_USCGS, 2005-09-14,  MCN ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH700936D_M,  CR14341,  NONE, 1.2228, 1.2719, 30, 16240
 z28x Z28_1933_USCGS, 2005-09-19,  JMS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE21,  ASH701945B_M,  CR519993706,  NONE, 1.2329, 1.2819, 30, 16490
 z28x Z28_1933_USCGS, 2010-09-17,  JLS ,  USGS ,  TRIMBLE,  4927175204 ,  NETRS NP,  ASH701945E_M,  CR520031622,  NONE, 1.158, 1.2079, 15, 135215
 z28x Z28_1933_USCGS, 2010-09-18,  CHS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH701945B_M,  CR519993703,  NONE, 1.1681, 1.2179, 15, 151145