benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 b240, 1998-09-18,  CWW ,  USGS ,  ASHTECH,  O4579 ,  Z-XII3 CB00,  ASH700936E_C,  CR16381,  NONE, 1.3419, 1.3898, 30, 15510
 B240, 2002-09-09,  WC ,  USGS MENLO PARK ,  TRIMBLE,  3337A03970 ,  4000SSE NP,  TRM22020.00+GP,  0220051878,  NONE, 1.6093, 0, 30, 163015
 b240 B240_unstmpd_Metal_m, 2002-09-10,  TXN ,  USGS MENLO PARK ,  TRIMBLE,  3616A15404 ,  4000SSI NP,  TRM22020.00+GP,  0080053861,  NONE, 1.4539, 0, 30, 175430