benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 pres Prescott_1934_1980_US, 1993-08-26,  ML ,  USGS ,  ASHTECH LM-XII3,  0831,  7A,  ASH700228A,  1027,  NONE, 1.0862, 1.137, 30, 18120
 pres Prescott_1934_1980_U, 1994-08-19,  GDH ,  USGS ,  ASHTECH,  764 ,  LM-XII3 7A,  ASH700228A,  0598,  NONE, 1.4202, 1.4674, 30, 153830
 pres Prescott_1934_1980_U, 2000-07-24,  GDH ,   ,  ASHTECH,  lp019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993706,  NONE, 1.1153, 1.1657, 30, 15310
 pres Prescott_1934_1980_U, 2000-07-25,  GDH ,   ,  ASHTECH,  lp019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993706,  NONE, 1.1153, 1.1657, 30, 10