benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 mtid, 2001-09-22,  WCH ,   ,  ASHTECH,  lp019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14329,  NONE, 1.166, 1.2158, 30, 15310
 mtid Mtid_USGS, 2006-09-09,  CHS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH700936D_M,  CR14244,  NONE, 0.461, 0.5309, 30, 163230
 mtid Mtid_USGS, 2006-09-10,  GDH ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE21,  ASH701945B_M,  CR619992801,  NONE, 0.6222, 0.6839, 30, 164730
 mtid Mtid_USGS, 2016-09-09,  ELP ,  USGS ,  JAVAD,  01659 ,  TRE_G3TH SIGMA3.5.1,  ASH701945E_M,  CR520031622,  NONE, 0.8448, 0.8999, 15, 19245
 mtid Mtid_USGS, 2016-09-10,  ELP ,  USGS ,  JAVAD,  01659 ,  TRE_G3TH SIGMA3.5.1,  ASH701945E_M,  CR520031622,  NONE, 0.8448, 0.8999, 15, 0
 mtid Mtid_USGS, 2016-09-11,  ELP ,  USGS ,  JAVAD,  01659 ,  TRE_G3TH SIGMA3.5.1,  ASH701945E_M,  CR520031622,  NONE, 0.8499, 0.9049, 15, 0