benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 shwd SHWD_stmped_SHER_USG, 2009-10-24,  CHS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR520031615,  NONE, 1.4116, 1.4589, 30, 152245
 shwd SHWD_stmped_SHER_USG, 2009-10-25,  CHS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR520031615,  NONE, 1.3672, 1.4149, 30, 153515
 shwd SHWD_stmped_SHER_USG, 2010-10-19,  CHS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH701945E_M,  CR620022601,  NONE, 1.3985, 1.4459, 15, 154115
 shwd SHWD_stmped_SHER_USG, 2010-10-20,  CHS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH701945E_M,  CR620022601,  NONE, 1.3965, 1.4439, 15, 153445
 shwd SHWD_stmped_SHER_USG, 2012-07-11,  CHS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR620022605,  NONE, 1.4227, 1.4699, 15, 153945
 shwd SHWD_stmped_SHER_USG, 2012-07-12,  CHS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR620022605,  NONE, 1.3985, 1.4459, 15, 153145