benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 cast Castle_1990_NGS, 1993-08-09,  WPK ,  USGS ,  ASHTECH L-XII,  006,  7A,  ASH700228A,  006,  NONE, 1.5173, 1.5638, 15, 205645
 cast Castle_1990_NGS, 1993-08-10,  WPK ,  USGS-CVO ,  ASHTECH LM-XII3,  006,  7A,  ASH700228A,  006,  NONE, 1.4431, 1.4901, 15, 211345
 cast Castle_1990_NGS, 1997-08-13,  unknown ,  CVO ,  Trimble 4000SSi,  16291,  NP,  TRM29659.00,  66915,  NONE, 1.2393, 0, 30, 133130
 cast Castle_1990_NGS, 1997-08-14,  unknown ,  CVO ,  Trimble 4000SSi,  16291,  NP,  TRM29659.00,  66915,  NONE, 1.4201, 0, 30, 132830
 cast Castle_1990_NGS, 1994-08-17,  GDH ,  USGS ,  ASHTECH,  764 ,  LM-XII3 7A,  ASH700228A,  0598,  NONE, 1.3569, 1.4047, 30, 144130
 cast Castle_1990_NGS, 2000-07-20,  GDH ,   ,  ASHTECH,  lp019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993706,  NONE, 1.2439, 1.2928, 30, 15380