benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 blac, 1999-09-10,  GWB ,  USGS ,  ASHTECH,  278 ,  Z-XII3 CD00,  ASH700936E_C,  CR16379,  NONE, 1.2762, 1.3248, 30, 1600
 blac, 1999-09-26,  GWB ,  USGS ,  ASHTECH,  O4597 ,  Z-XII3 CC00,  ASH701945.02B,  CR619992801,  NONE, 1.3661, 1.4138, 30, 15470
 blac, 2003-06-25,  WRT ,  USGS ,  ASHTECH,  LP019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993706,  NONE, 1.4842, 1.5309, 30, 155930
 blac Blac_stmpd_Y425_1984, 2003-06-26,  FFP ,  USGS ,  ASHTECH,  04600 ,  Z-XII3 CD00,  ASH700936D_M,  CR14244,  NONE, 1.1783, 1.2279, 30, 15550
 blac Blac_Y425_1984_NGS, 2008-09-26,  WRT ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945B_M,  CR519993703,  NONE, 1.5195, 1.5659, 30, 163420