benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 i018 I018_stamped_D1223_19, 1995-04-13,  -Unknown- ,  CALIF DEPT TRANSPORT,  TRIMBLE 4000,  7369,  SSE,  TRM14532.00,  SN_UNKNOWN,  NONE, 2.217, 0, 15, 193415
 i018 I018_stamped_D1223_19, 1995-04-17,  -Unknown- ,  CALIF DEPT TRANSPORT,  TRIMBLE 4000,  7369,  SSE,  TRM14532.00,  SN_UNKNOWN,  NONE, 2.217, 0, 15, 151745
 i018 I018_stamped_D1223_19, 2003-05-05,  SJB ,  SCRIPPS INSTITUTION ,  ASHTECH Z-XII3,  319,  CC00,  ASH700936A_M,  756,  NONE, 0.9175, 0, 30, 15390
 i018 I018_stamped_D1223_1, 2010-04-08,  CHS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE210,  ASH701945E_M,  CR520031615,  NONE, 1.1651, 1.2149, 15, 144645
 i018 I018_stamped_D1223_1, 2010-04-12,  CHS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE210,  ASH701945E_M,  CR520031615,  NONE, 1.1965, 1.2459, 15, 152545