benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 shwn Sherwin_1933_USC&GS, 1994-07-17,  WKG ,  USGS ,  ASHTECH,  347 ,  LM-XII3 7X,  ASH700228A,  0163,  NONE, 1.3419, 1.3898, 30, 10
 shwn Sherwin_1933_USC&GS, 2010-03-28,  JMS ,  USGS ,  TRIMBLE,  0220320193 ,  5700 NP,  TRM41249.00,  60249097,  NONE, 0.5676, 0.6351, 15, 30
 shwn Sherwin_1933_USC&GS, 2010-03-29,  JMS ,  USGS ,  TRIMBLE,  0220320193 ,  5700 NP,  TRM41249.00,  60249097,  NONE, 0.5676, 0.6351, 15, 30