benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 CDUS, 2000-11-18,  WRT ,   ,  ASHTECH,  O4579 ,  Z-XII3 CC00,  ASH701945.02B,  CR619992801,  NONE, 1.3298, 1.3778, 30, 17120
 CDUS, 2000-11-19,  WRT ,   ,  ASHTECH,  O4579 ,  Z-XII3 CC00,  ASH701945.02B,  CR619992801,  NONE, 1.3197, 1.3678, 30, 30
 CDUS, 2004-09-19,  WRT ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14329,  NONE, 1.3269, 1.3749, 30, 162030
 CDUS CEDA_USGS, 2009-09-12,  JMS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE210,  ASH700936D_M,  CR14329,  NONE, 0.6823, 0.7418, 30, 0
 CDUS CEDA_USGS, 2009-09-13,  JMS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE210,  ASH700936D_M,  CR14329,  NONE, 0.6823, 0.7418, 30, 0