benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 29jc 29JCM_1982_USGS, 2006-07-11,  JLS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH701945B_M,  CR519993703,  NONE, 0.5542, 0.6188, 30, 15310
 29jc 29JCM_1982_USGS, 2006-07-12,  CHS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE21,  ASH701945B_M,  CR519993702,  NONE, 1.3087, 1.3569, 30, 153130