benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 p157, 2001-09-12,  TD ,  USGS ,  TRIMBLE,  3608A14594 ,  4000SSI NP,  TRM29659.00,  0220073545,  NONE, 1.1777, 0, 0, 175330
 p157, 2001-09-21,  TD ,  USGS ,  TRIMBLE,  3608A14632 ,  4000SSI NP,  TRM29659.00,  0220089288,  NONE, 1.1372, 0, 0, 154430
 p157 P.T.157+89.5_50_ID_D, 2006-09-13,  CMH ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.2278, 1.2769, 30, 16130
 p157 P.T.157+89.5_50_ID_D, 2006-09-22,  BW_ ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031615,  NONE, 1.16, 1.2099, 30, 1620