benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 hdqt, 2001-09-15,  CWW ,   ,  ASHTECH,  02270 ,  Z-XII3 CC00,  ASH701945B_M,  CR519992603,  NONE, 1.4488, 1.4958, 30, 134230
 hdqt Hdqt_USGS, 2005-09-13,  GDH ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH701945B_M,  CR619992801,  NONE, 1.239, 1.2879, 30, 155930
 hdqt Hdqt_USGS, 2006-09-20,  CMH ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.245, 1.2939, 30, 15350
 hdqt Hdqt_USGS, 2016-09-08,  ELP ,  USGS ,  JAVAD,  01659 ,  TRE_G3TH SIGMA3.5.1,  ASH701945E_M,  CR520031615,  NONE, 0.8089, 0.8648, 15, 143615
 hdqt Hdqt_USGS, 2016-09-13,  ELP ,  USGS ,  JAVAD,  01659 ,  TRE_G3TH SIGMA3.5.1,  ASH701945E_M,  CR520031615,  NONE, 0.7864, 0.8429, 15, 145045