benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 z425, 2003-09-14,  CHS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022602,  NONE, 1.3723, 1.4199, 30, 1590
 z425, 2003-09-16,  JMS ,  USGS ,  ASHTECH,  04600 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022601,  NONE, 1.5255, 1.5719, 30, 162730
 z425 Z425_1988_NGS, 2012-09-17,  WRT ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE210,  ASH701945B_M,  CR619992801,  NONE, 1.5255, 1.5719, 15, 164645
 z425 Z425_1988_NGS, 2015-09-21,  SAH ,  USGS ,  ASHTECH,  ZE1200411029 ,  Z-X ZE210,  ASH701945E_M,  CR620022602,  NONE, 1.2733, 1.3219, 15, 151245