benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 p99x, 2003-09-13,  MRF ,  USGS ,  ASHTECH,  04597 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993703,  NONE, 1.2359, 1.2849, 30, 152930
 p99x P99_1960_USC&GS, 2007-09-18,  CHS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH700936D_M,  CR14333,  NONE, 1.2976, 1.3459, 30, 15220
 p99x P99_1960_USC&GS, 2007-09-19,  CHS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH700936D_M,  CR14333,  NONE, 1.2703, 1.3189, 30, 14550
 p99x P99_1960_USC&GS, 2011-09-17,  JLS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 0.6232, 0.6849, 15, 133945
 p99x P99_1960_USC&GS, 2015-09-11,  ELP ,  USGS ,  JAVAD,  00598 ,  TRE_G3TH SIGMA3.3.1,  JAVRINGANT_DM,  00574,  NONE, 0.703, 0.7619, 15, 141745
 p99x P99_1960_USC&GS, 2015-09-12,  ELP ,  USGS ,  JAVAD,  00598 ,  TRE_G3TH SIGMA3.3.1,  JAVRINGANT_DM,  00488,  NONE, 0.6357, 0.6969, 15, 124845