benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 r500 leveling_benchmark_so, 2004-06-05,  Parker ,  USGS ,  TRIMBLE 4000SSI,  16325,  NP,  TRM29659.00,  66915,  NONE, 1.2749, 0, 0, 152630
 r500 leveling_benchmark_so, 2004-06-08,  Konfal ,  USGS ,  TRIMBLE 4000SSI,  14804,  NP,  TRM29659.00,  66593,  NONE, 1.4226, 0, 0, 16530
 r500 leveling_benchmark_s, 1996-09-06,  UC BERKELEY ,   ,  TRIMBLE,  14632 ,  4000SSI 7.09,  TRM22020.00+GP,  50501,  NONE, 1.3375, 0, 30, 300.003
 r500 leveling_benchmark_s, 1996-09-08,  UC BERKELEY ,   ,  TRIMBLE,  14594 ,  4000SSI 7.09,  TRM22020.00+GP,  50362,  NONE, 1.1689, 0, 30, 3029.999
 r500 leveling_benchmark_s, 1999-07-27,  UC BERKELEY ,   ,  TRIMBLE,  5699 ,  4000SSE 7.29,  TRM22020.00+GP,  18931,  NONE, 1.2594, 0, 30, 172730
 r500 leveling_benchmark_s, 1999-07-28,  UC BERKELEY ,   ,  TRIMBLE,  5699 ,  4000SSE 7.29,  TRM22020.00+GP,  18931,  NONE, 1.2614, 0, 30, 163730
 r500, 2012-07-17,  M Lisowski ,  USGS/Cascades Volcan,  TRIMBLE,  220214232 ,  4700 1.35,  TRM41249.00,  60194583,  NONE, 0.6394, 0.7045, 15, 0
 r500, 2012-07-18,  M Lisowski ,  USGS/Cascades Volcan,  TRIMBLE,  220214232 ,  4700 1.35,  TRM41249.00,  60194583,  NONE, 0.6394, 0.7045, 15, 0
 r500, 2012-07-19,  M Lisowski ,  USGS/Cascades Volcan,  TRIMBLE,  220214232 ,  4700 1.35,  TRM41249.00,  60194583,  NONE, 0.6394, 0.7045, 15, 0