benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 el48, 1999-09-28,  JTB ,   ,  ASHTECH,  203 ,  Z-XII3 CD00,  ASH700936E_C,  CR16374,  NONE, 0.6925, 0.7517, 30, 162830
 el48 EL48_stmpd_ELEV_4884, 2003-07-03,  WCH ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022605,  NONE, 1.1621, 1.2119, 30, 16170
 el48 EL48_stmpd_ELEV_4884, 2008-09-12,  CWW ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII 1L00,  ASH700936D_M,  CR14329,  NONE, 1.2511, 1.2999, 30, 15140
 el48 EL48_stmpd_ELEV_4884, 2008-09-13,  GDH ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII 1L00,  ASH701945E_M,  CR620022601,  NONE, 1.2521, 1.3009, 30, 153530