benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 monu, 2003-09-22,  WRT ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.2642, 1.3129, 30, 16190
 monu, 2003-09-23,  WRT ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.2642, 1.3129, 30, 0
 monu MONU_USGS, 2007-09-13,  JMS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE21,  ASH701945B_M,  CR519993702,  NONE, 0.7607, 0.8179, 30, 0
 monu MONU_USGS, 2007-09-14,  JMS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE21,  ASH701945B_M,  CR519993702,  NONE, 0.7607, 0.8179, 30, 0
 monu MONU_USGS, 2015-09-12,  JLS ,  USGS ,  JAVAD,  01663 ,  TRE_G3TH SIGMA3.5.9,  ASH700936D_M,  CR14341,  NONE, 0.6274, 0.6889, 15, 0