benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 z140, 2001-09-14,  TD ,  USGS ,  TRIMBLE,  3608A14632 ,  4000SSI NP,  TRM29659.00,  0220073545,  NONE, 0.8811, 0, 0, 144530
 z140, 2001-09-23,  WCH ,   ,  ASHTECH,  lp019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14329,  NONE, 0.7224, 0.7807, 30, 151530
 z140 Z140_USGS, 2006-09-10,  CHS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH700936D_M,  CR14244,  NONE, 1.2329, 1.2819, 30, 151230
 z140 Z140_USGS, 2012-09-16,  JLS ,  USGS ,  JAVAD,  00621 ,  TRE_G3TH SIGMA3.3.1,  JAVRINGANT_DM,  00574,  NONE, 0.6937, 0.7529, 15, 152945
 z140 Z140_USGS, 2012-09-17,  JLS ,  USGS ,  JAVAD,  00621 ,  TRE_G3TH SIGMA3.3.1,  JAVRINGANT_DM,  00574,  NONE, 0.6937, 0.7529, 15, 0
 z140 Z140_USGS, 2012-09-18,  JLS ,  USGS ,  JAVAD,  00621 ,  TRE_G3TH SIGMA3.3.1,  JAVRINGANT_DM,  00574,  NONE, 0.6937, 0.7529, 15, 0
 z140 Z140_USGS, 2012-09-19,  JLS ,  USGS ,  JAVAD,  00621 ,  TRE_G3TH SIGMA3.3.1,  JAVRINGANT_DM,  00574,  NONE, 0.6937, 0.7529, 15, 0