benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 b121 B1211_RESET_1978_NGS, 2007-04-04,  CHS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH700936D_M,  CR14329,  NONE, 1.4378, 1.4849, 30, 153530
 b121 B1211_RESET_1978_NGS, 2007-04-11,  CHS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH700936D_M,  CR14329,  NONE, 1.3481, 1.3959, 30, 151830
 b121 B1211_RESET_1978_NGS, 2009-05-05,  CHS ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII 1L001,  ASH701945B_M,  CR619992805,  NONE, 1.4479, 1.4949, 30, 1590
 b121 B1211_RESET_1978_NGS, 2009-05-28,  CHS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH701945B_M,  CR519993703,  NONE, 1.4167, 1.464, 30, 15180
 b121 B1211_RESET_1978_NGS, 2013-10-27,  JLS ,  USGS ,  JAVAD,  00588 ,  TRE_G3TH SIGMA3.3.1,  ASH700936D_M,  CR14333,  NONE, 1.3803, 1.4279, 15, 145115
 b121 B1211_RESET_1978_NGS, 2013-10-28,  JMS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE210,  ASH701945E_M,  CR520031626,  NONE, 1.5406, 1.5869, 15, 17045
 b121 B1211_RESET_1978_NGS, 2019-04-05,  ELP ,  USGS ,  JAVAD,  01337 ,  TRE_G3TH SIGMA3.5.1,  JAVRINGANT_DM,  00585,  NONE, 1.4207, 1.4679, 15, 14445
 b121 B1211_RESET_1978_NGS, 2019-04-23,  ELP ,  USGS ,  JAVAD,  01657 ,  TRE_G3TH SIGMA3.7.6,  JAVRINGANT_DM,  00459,  NONE, 1.1945, 1.2439, 15, 1710