benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 cntr Central_1990_NGS, 1993-08-18,  DDZ ,  USGS-CVO ,  ASHTECH LM-XII3,  009,  7A,  ASH700228D,  009,  NONE, 1.4503, 1.4973, 15, 203645
 cntr Central_1990_NGS, 1993-08-19,  DDZ ,  USGS-CVO ,  ASHTECH LM-XII3,  009,  7A26,  ASH700228D,  009,  NONE, 1.3785, 1.4261, 15, 194515
 cntr Central_1990_NGS, 1995-08-05,  CHS ,  USGS ,  ASHTECH,  830 ,  LM-XII3 7A,  ASH700228A,  0718,  NONE, 1.3388, 1.3867, 30, 16220
 cntr Central_1990_NGS, 1995-08-07,  GDH ,  USGS ,  ASHTECH,  *LP00108 ,  LM-XII3 7A,  ASH700228A,  1026,  NONE, 1.2544, 1.3032, 30, 1530
 cntr Central_1990_NGS, 1997-08-15,  CHS ,  USGS ,  ASHTECH,  O4582 ,  Z-XII3 1E95,  ASH700936D_M,  CR14244,  NONE, 1.3177, 1.3658, 30, 155230
 cntr Central_1990_NGS, 1997-08-17,  GDH ,  USGS ,  ASHTECH,  O4597 ,  Z-XII3 1E95,  ASH700936D_M,  CR14329,  NONE, 1.2692, 1.3178, 30, 15590
 cntr Central_1990_NGS, 1999-08-25,  CHS ,   ,  ASHTECH,  O4579 ,  Z-XII3 CC00,  ASH700936D_M,  CR14329,  NONE, 1.2803, 1.3288, 30, 15230
 cntr Central_1990_NGS, 1999-08-27,  GDH ,  USGS ,  ASHTECH,  174 ,  Z-XII3 CB001,  ASH700936D_M,  CR14341,  NONE, 1.1974, 1.2468, 30, 1590
 cntr Central_1990_NGS, 2001-03-04,  JMS ,   ,  ASHTECH,  O4591 ,  Z-XII3 CD00,  ASH701945.02B,  CR619992801,  NONE, 1.3399, 1.3878, 30, 164130
 cntr Central_1990_NGS, 2001-03-05,  CHS ,   ,  ASHTECH,  lp019992804 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993706,  NONE, 1.3459, 1.3938, 30, 17150