benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 gbsn, 2003-09-10,  WRT ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.5416, 1.5879, 30, 155330
 gbsn, 2003-09-13,  WRT ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.5275, 1.5739, 30, 162230
 gbsn GBSN_1998_NGS, 2007-09-19,  WRT ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH701945B_M,  CR619992805,  NONE, 1.4538, 1.5007, 30, 1600
 gbsn GBSN_1998_NGS, 2007-09-22,  WRT ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH701945B_M,  CR619992805,  NONE, 1.2945, 1.3429, 30, 173830
 gbsn GBSN_1998_NGS, 2012-09-20,  WRT ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE210,  ASH701945B_M,  CR619992801,  NONE, 1.5668, 1.6129, 15, 154615
 gbsn GBSN_1998_NGS, 2012-09-22,  WRT ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE210,  ASH701945B_M,  CR619992801,  NONE, 1.588, 1.634, 15, 153545