benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 nbcg NBCG_1991_USGS, 1998-11-06,  GRD/NGS/NOAA ,  NGS/NOAA ,  TRIMBLE SSI,  3748A20591,  7.27,  TRM33429.00+GP,  0220108548,  NONE, 1.7761, 0, 15, 154630
 nbcg NBCG_1991_USGS, 1993-08-29,   ,  USGS ,  ROGUE,  T205 ,  SNR-8000 93.06,  AOAD/M_T,  226,  NONE, 1.7148, 0, 30, 0
 nbcg NBCG_1991_USGS, 1993-08-30,  ML ,  USGS ,  ROGUE,  T205 ,  SNR-8000 93.06,  AOAD/M_T,  226,  NONE, 1.7148, 0, 30, 0
 nbcg NBCG_1991_USGS, 1993-08-31,  ML ,  USGS ,  ROGUE,  T205 ,  SNR-8000 93.06,  AOAD/M_T,  226,  NONE, 1.7148, 0, 30, 0
 nbcg NBCG_1991_USGS, 1993-09-01,  ML ,  USGS ,  ROGUE,   205 ,  SNR-8000 93.06,  AOAD/M_T,  226,  NONE, 1.7148, 0, 30, 0
 nbcg NBCG_1991_USGS, 1993-09-02,  ML ,  USGS ,  ROGUE,   205 ,  SNR-8000 93.06,  AOAD/M_T,  226,  NONE, 1.7148, 0, 30, 0
 nbcg NBCG_1991_USGS, 1993-09-03,  ML ,  USGS ,  ROGUE,   205 ,  SNR-8000 93.06,  AOAD/M_T,  226,  NONE, 1.7148, 0, 30, 0
 nbcg NBCG_1991_USGS, 1993-09-04,  ML ,  USGS ,  ROGUE,   205 ,  SNR-8000 93.06,  AOAD/M_T,  226,  NONE, 1.7148, 0, 30, 0
 nbcg NBCG_1991_USGS, 1993-09-05,  ML ,  USGS ,  ROGUE,   205 ,  SNR-8000 93.06,  AOAD/M_T,  226,  NONE, 1.7148, 0, 30, 0
 nbcg NBCG_1991_USGS, 1996-08-04,  GDH ,  USGS ,  ASHTECH,  143 ,  Z-XII3 1F00,  ASH700718B,  11401,  NONE, 1.2541, 1.3029, 30, 11530
 nbcg NBCG_1991_USGS, 1996-08-05,  GDH ,  USGS ,  ASHTECH,  143 ,  Z-XII3 1F00,  ASH700718B,  11401,  NONE, 1.2541, 1.3029, 30, 0
 nbcg NBCG_1991_USGS, 1996-08-06,  GDH ,  USGS ,  ASHTECH,  143 ,  Z-XII3 1F00,  ASH700718B,  11401,  NONE, 1.2541, 1.3029, 30, 170
 nbcg NBCG_1991_USGS, 1996-08-07,  GDH ,  USGS ,  ASHTECH,  143 ,  Z-XII3 1F00,  ASH700718B,  11401,  NONE, 1.2541, 1.3029, 30, 0
 nbcg NBCG_1991_USGS, 1996-08-08,  GDH ,  USGS ,  ASHTECH,  143 ,  Z-XII3 1F00,  ASH700718B,  11401,  NONE, 1.2541, 1.3029, 30, 0
 nbcg NBCG_1991_USGS, 1996-08-09,  GDH ,  USGS ,  ASHTECH,  143 ,  Z-XII3 1F00,  ASH700718B,  11401,  NONE, 1.2541, 1.3029, 30, 0
 nbcg NBCG_1991_USGS, 2002-08-17,  JMS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 1.5225, 1.5689, 30, 163130
 nbcg NBCG_1991_USGS, 2002-08-18,  JMS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 1.5225, 1.5689, 30, 10
 nbcg NBCG_1991_USGS, 2004-08-19,  GDH ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE00,  ASH700936D_M,  CR14329,  NONE, 1.2764, 1.3249, 30, 0
 nbcg NBCG_1991_USGS, 2004-08-20,  GDH ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE00,  ASH700936D_M,  CR14329,  NONE, 1.2764, 1.3249, 30, 0
 nbcg NBCG_1991_USGS, 2004-08-21,  GDH ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE00,  ASH700936D_M,  CR14329,  NONE, 1.2764, 1.3249, 30, 0