benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 ll92, 2000-11-17,  JMS ,  USGS ,  ASHTECH,  O4582 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 1.0474, 1.0988, 30, 10
 ll92, 2004-09-16,  CHS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE00,  ASH701945E_M,  CR620022601,  NONE, 1.1529, 1.2029, 30, 15230
 ll92, 2004-09-17,  CHS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE00,  ASH701945E_M,  CR620022601,  NONE, 1.1529, 1.2029, 30, 0
 ll92, 2004-09-20,  WRT ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14329,  NONE, 1.1671, 1.2169, 30, 1140
 ll92, 2004-09-21,  WRT ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14329,  NONE, 1.1671, 1.2169, 30, 30
 ll92, 2004-09-22,  WRT ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14329,  NONE, 1.1671, 1.2169, 30, 30
 ll92 LL92_USGS, 2009-09-14,  CHS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH701945E_M,  CR620022605,  NONE, 0.4695, 0.5388, 30, 0
 ll92 LL92_USGS, 2009-09-15,  CHS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH701945E_M,  CR620022605,  NONE, 0.4695, 0.5388, 30, 0