benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 base, 2003-09-21,  WRT ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.455, 1.5019, 30, 15410
 base, 2003-09-22,  CHS ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 0.594, 0.6568, 30, 830
 base SoutheastBase_1922_U, 2007-09-20,  SBM ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII 1L00,  ASH701945B_M,  CR519993706,  NONE, 1.2622, 1.3109, 30, 162930
 base SoutheastBase_1922_U, 2007-09-30,  WRT ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH701945B_M,  CR619992805,  NONE, 1.3985, 1.4459, 30, 1100
 base SoutheastBase_1922_U, 2015-09-18,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.3.1,  ASH700936D_M,  CR14330,  NONE, 0.7977, 0.8539, 15, 0
 base SoutheastBase_1922_U, 2015-09-29,  WRT ,  USGS ,  JAVAD,  00620 ,  TRE_G3TH SIGMA-Unkn,  ASH701945E_M,  CR520031615,  NONE, 1.4298, 1.4769, 15, 930