benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 g270 G270_stmpd_3215S_USG, 1992-10-21,   ,   ,  TURBOROGUE,  123 ,   ,  AOAD/M_T,  122,  NONE, 1.1607, 0, 30, 15480
 g270 G270_stmpd_3215S_USG, 1992-10-22,   ,   ,  TURBOROGUE,  133 ,   ,  AOAD/M_T,  133,  NONE, 1.1995, 0, 30, 155530
 g270 G270_stmpd_3215S_USG, 1992-10-23,   ,   ,  TURBOROGUE,  133 ,   ,  AOAD/M_T,  133,  NONE, 1.1995, 0, 30, 0
 g270, 1996-09-30,  T.S ,  USGS ,  ASHTECH,  347 ,  Z-XII3 1G00,  unknown,  *163,  NONE, 1.3709, 0, 30, 15370
 g270, 1998-09-28,  JTB ,  USGS ,  ASHTECH,  188 ,  Z-XII3 CB00,  ASH700936D_M,  CR14333,  NONE, 1.2985, 1.3468, 30, 145730
 g270 G270_stmpd_3215S_USG, 2002-09-14,  TJW ,  USGS MENLO PARK ,  TRIMBLE,  4005A27619 ,  4000SSI NP,  TRM22020.00+GP,  0080053858,  NONE, 1.0543, 0, 30, 1610
 g270 G270_stmpd_3215S_USG, 2002-09-20,  WC ,  USGS MENLO PARK ,  TRIMBLE,  4005A27617 ,  4000SSI NP,  TRM22020.00+GP,  0220051636,  NONE, 0.8045, 0, 30, 155130