benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 a275, 1998-09-16,  WRT ,  USGS ,  ASHTECH,  O4597 ,  Z-XII3 CB00,  ASH700936D_M,  *874,  NONE, 1.3207, 1.3688, 30, 162330
 a275 A275_stmpd_Sta_E-185, 2002-09-09,  MCN ,  USGS ,  ASHTECH,  04600 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.3168, 1.3649, 30, 154030
 a275 A275_stmpd_Sta_E-185, 2002-09-10,  WRT ,  USGS ,  ASHTECH,  04597 ,  Z-XII3 CC00,  ASH701945B_M,  CR519993702,  NONE, 1.3864, 1.4339, 30, 16930
 a275 A275_stmpd_Sta_E-185, 2004-05-18,  GDH ,  USGS ,  ASHTECH,  ZE120033802 ,  Z-X ZE00,  ASH700936D_M,  CR14329,  NONE, 1.2561, 1.3049, 30, 1600
 a275 A275_stmpd_Sta_E-185, 2004-05-21,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031615,  NONE, 1.3147, 1.3629, 30, 15830