benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 a281, 2000-08-23,  CHS ,   ,  ASHTECH,  801 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.2328, 1.2818, 30, 1630
 a281 A281_stmpd_N200_No.2, 2002-09-09,  TXN ,  USGS MENLO PARK ,  TRIMBLE,  3616A15404 ,  4000SSI NP,  TRM22020.00+GP,  0080053861,  NONE, 1.1849, 0, 30, 15220
 a281 A281_stmpd_N200_No.2, 2002-09-10,  TJW ,  USGS MENLO PARK ,  TRIMBLE,  4005A27619 ,  4000SSI NP,  TRM22020.00+GP,  0080053858,  NONE, 0.9345, 0, 30, 155430