benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 b270 B270_stmpd_U46_1934_, 1992-10-08,   ,   ,  TURBOROGUE,  111 ,   ,  AOAD/M_T,  111,  NONE, 1.1074, 0, 30, 152730
 b270, 1996-09-20,  T.S ,  USGS ,  ASHTECH,  347 ,  Z-XII3 1G00,  unknown,  *163,  NONE, 1.3141, 0, 30, 15460
 b270, 1998-09-18,  JTB ,  USGS ,  ASHTECH,  188 ,  Z-XII3 CB00,  ASH700936D_M,  CR14333,  NONE, 1.3974, 1.4448, 30, 155030
 b270, 2000-08-19,  CHS ,   ,  ASHTECH,  4600 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.3076, 1.3558, 30, 15030
 b270, 2000-08-20,  JMS ,   ,  ASHTECH,  O4597 ,  Z-XII3 CC00,  ASH700936D_M,  CR14244,  NONE, 1.3389, 1.3869, 30, 163030
 b270 B270_stmpd_U46_1934_, 2002-09-10,  SO.JH ,  USGS MENLO PARK ,  TRIMBLE,  3427A06745 ,  4000SSE NP,  TRM22020.00+GP,  0220052070,  NONE, 1.4619, 0, 30, 15160
 b270 B270_stmpd_U46_1934_, 2002-09-18,  WRT ,  USGS ,  ASHTECH,  04597 ,  Z-XII3 CC00,  ASH701945B_M,  CR519993702,  NONE, 1.3087, 1.3569, 30, 161030