benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 chlf Chalfant_1933_USC&GS, 1994-07-17,  JLS ,  USGS ,  ASHTECH,  344 ,  LM-XII3 7X,  ASH700228A,  0175,  NONE, 0.3438, 0.4234, 30, 0