benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 9991, 2001-09-14,  TD ,  USGS ,  TRIMBLE,  3608A14594 ,  4000SSI NP,  TRM29659.00,  0220089288,  NONE, 1.5665, 0, 0, 15590
 9991, 2001-09-23,  WCH ,   ,  ASHTECH,  lp019992803 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.5738, 1.6199, 30, 16160
 9991 109991_s_2001_USGS, 2012-09-15,  JLS ,  USGS ,  JAVAD,  00620 ,  TRE_G3TH SIGMA3.3.1,  ASH700936D_M,  CR14329,  NONE, 1.601, 1.6469, 15, 135315
 9991 109991_s_2001_USGS, 2012-09-17,  JLS ,  USGS ,  JAVAD,  00598 ,  TRE_G3TH SIGMA3.3.1,  ASH700936D_M,  CR14329,  NONE, 1.5779, 1.6239, 15, 14415
 9991 109991_s_2001_USGS, 2016-08-31,  WRT ,  USGS ,  JAVAD,  01337 ,  TRE_G3TH SIGMA3.5.1,  ASH700936D_M,  CR14329,  NONE, 1.6594, 1.7049, 15, 145745
 9991 109991_s_2001_USGS, 2016-09-05,  WRT ,  USGS ,  JAVAD,  01337 ,  TRE_G3TH SIGMA3.5.1,  ASH700936D_M,  CR14329,  NONE, 1.599, 1.6449, 15, 153930