benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 u123 U123_1932_USC&GS, 1993-07-12,  GAM ,  USGS ,  ASHTECH LM-XII3,  104,  7A26,  ASH700228D,  1068,  NONE, 1.1798, 1.2294, 30, 23210
 u123 U123_1932_USC&GS, 1992-08-14,  GAM ,  USGS ,  ASHTECH,  0831 ,  LM-XII3 7A,  ASH700228A,  1027,  NONE, 1.2536, 1.3024, 30, 18580
 u123 U123_1932_USC&GS, 1994-07-28,  WKG ,  USGS ,  ASHTECH,  765 ,  LM-XII3 7A,  ASH700228D,  1058,  NONE, 1.3509, 1.3987, 30, 142230