benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 bcrk, 2001-09-20,  GB ,  USGS ,  TRIMBLE,  3608A14631 ,  4000SSI NP,  TRM29659.00,  0220073540,  NONE, 1.363, 0, 0, 153330
 bcrk, 2001-09-21,  GB ,  USGS ,  TRIMBLE,  3608A14631 ,  4000SSI NP,  TRM29659.00,  0220073540,  NONE, 1.363, 0, 0, 0
 bcrk Bcrk_USGS, 2006-09-25,  WRT ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993703,  NONE, 1.1722, 1.2219, 30, 0
 bcrk Bcrk_USGS, 2010-09-19,  JLS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 0.7658, 0.8228, 15, 175945
 bcrk Bcrk_USGS, 2010-09-20,  JLS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 0.7658, 0.8228, 15, 0
 bcrk Bcrk_USGS, 2010-09-21,  JLS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 0.7658, 0.8228, 15, 0