benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 tolt Tolt_Unstamped_USGS, 1994-08-12,  CHS ,  USGS ,  ASHTECH,  99 ,  LM-XII3 7A,  ASH700228D,  1036,  NONE, 1.4302, 1.4773, 30, 18420