benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 a811, 2003-09-11,  MAJ ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.4519, 1.4988, 30, 16570
 a811, 2003-09-12,  SHY ,  USGS ,  ASHTECH,  LP019992809 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993706,  NONE, 1.3541, 1.4019, 30, 15540
 a811 A81_1934_USC&GS, 2007-09-17,  CHS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE21,  ASH700936D_M,  CR14330,  NONE, 1.4308, 1.4779, 30, 14430
 a811 A81_1934_USC&GS, 2007-09-21,  CHS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE21,  ASH700936D_M,  CR14330,  NONE, 1.4338, 1.4809, 30, 141730
 a811 A81_1934_USC&GS, 2015-09-11,  SW ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE210,  ASH700936D_M,  CR14244,  NONE, 0.7442, 0.8018, 15, 143015
 a811 A81_1934_USC&GS, 2015-09-12,  SW ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE210,  ASH700936D_M,  CR14244,  NONE, 0.7442, 0.8018, 15, 0
 a811 A81_1934_USC&GS, 2015-09-13,  SW ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE210,  ASH700936D_M,  CR14244,  NONE, 0.7442, 0.8018, 15, 0