benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 n469 N_469_1974, 1998-11-06,  GRD/NGS/NOAA ,  NGS/NOAA ,  TRIMBLE SSI,  3748A20591,  7.27,  TRM22020.00+GP,  0220108548,  NONE, 2, 0, 15, 154045
 n469 N_469_1974, 1998-11-09,  GRD/NGS/NOAA ,  NGS/NOAA ,  TRIMBLE SSI,  3748A20591,  7.27,  TRM22020.00+GP,  0220108548,  NONE, 2, 0, 15, 193345
 n469 N_469_1974, 1998-11-10,  GRD/NGS/NOAA ,  NGS/NOAA ,  TRIMBLE SSI,  3748A20591,  7.27,  TRM22020.00+GP,  0220108548,  NONE, 2, 0, 15, 15250
 n469 N_469_1974, 2002-08-14,  CHS ,  USGS ,  ASHTECH,  04600 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993703,  NONE, 1.346, 1.3939, 30, 15370
 n469 N_469_1974, 2002-08-15,  JLS ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH700936D_M,  CR14244,  NONE, 1.161, 1.2109, 30, 154530
 n469 N_469_1974, 2004-08-20,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 0.6606, 0.7209, 30, 30
 n469 N_469_1974, 2004-08-21,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 0.6606, 0.7209, 30, 30