benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 butn, 1999-09-11,  JTB ,  USGS ,  ASHTECH,  203 ,  Z-XII3 CD00,  ASH700936E_C,  CR16374,  NONE, 1.2853, 1.3337, 30, 1600
 butn, 1999-09-23,  JTB ,  USGS ,  ASHTECH,  203 ,  Z-XII3 CD00,  ASH700936E_C,  CR16374,  NONE, 1.2206, 1.2698, 30, 155030
 butn Butn_stmpd_BM_No.1-0, 2003-06-21,  MCN ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022601,  NONE, 1.2875, 1.336, 30, 155130
 butn Butn_stmpd_BM_No.1-0, 2003-06-25,  WCH ,  USGS ,  ASHTECH,  LP02232 ,  Z-XII3 6J00,  ASH701945E_M,  CR620022605,  NONE, 1.1772, 1.2269, 30, 16110
 butn Butn_stmpd_BM_No.1-0, 2008-09-15,  JLS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH700936D_M,  CR14333,  NONE, 0.5595, 0.6239, 30, 14015
 butn Butn_stmpd_BM_No.1-0, 2008-09-16,  JLS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH700936D_M,  CR14333,  NONE, 0.5595, 0.6239, 30, 0
 butn Butn_stmpd_BM_No.1-0, 2008-09-17,  JLS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH700936D_M,  CR14333,  NONE, 0.5595, 0.6239, 30, 0
 butn Butn_stmpd_BM_No.1-0, 2008-09-18,  JLS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH700936D_M,  CR14333,  NONE, 0.5595, 0.6239, 30, 0