benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 44do 44DOR_1975_USGS, 2006-07-16,  GDH ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945B_M,  CR519993706,  NONE, 0.511, 0.5779, 30, 16340
 44do 44DOR_1975_USGS, 2006-07-19,  GDH ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945B_M,  CR519993706,  NONE, 0.4749, 0.5438, 30, 16340
 44do 44DOR_1975_USGS, 2006-07-20,  GDH ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945B_M,  CR519993706,  NONE, 0.4749, 0.5438, 30, 0