benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 trr1 Tru_Rm1_USGS, 1995-07-07,  JMS ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 1E00,  ASH700228A,  0745,  NONE, 1.4262, 1.4734, 30, 17380
 trr1 Tru_Rm1_USGS, 1995-07-18,  GDH ,  USGS ,  ASHTECH,  *LP00141 ,  Z-XII3 1E24,  ASH700718B,  11401,  NONE, 1.2844, 1.3329, 30, 173830