benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 a255, 1998-09-15,  WRT ,  USGS ,  ASHTECH,  O4597 ,  Z-XII3 CB00,  ASH700936D_M,  *874,  NONE, 1.1903, 1.2398, 30, 153630
 a255 A255_stmpd_Sta_K405+, 2002-09-09,  WRT ,  USGS ,  ASHTECH,  04597 ,  Z-XII3 CC00,  ASH701945B_M,  CR519993702,  NONE, 1.4267, 1.4739, 30, 15540
 a255 A255_stmpd_Sta_K405+, 2002-09-21,  JH ,  USGS MENLO PARK ,  TRIMBLE,  3427A06745 ,  4000SSE NP,  TRM22020.00+GP,  0220052070,  NONE, 1.4198, 0, 30, 15290
 a255 A255_stmpd_Sta_K405+, 2004-05-23,  CHS ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031615,  NONE, 1.3955, 1.4429, 30, 151930