benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 y609 Y609_1942_USCGS, 1994-06-21,  W. JESTER ,  CALIF DEPT TRANSPORT,  TRIMBLE 4000,  4783,  SSE,  TRM14532.00,  4997,  NONE, 1.2009, 0, 30, 145730
 y609 Y609_1942_USCGS, 1994-10-29,   ,  USGS ,  TRIMBLE 4000,  1552,  SSE,  TRM22020.00+GP,  64330,  NONE, 1.0835, 0, 15, 235845
 y609 Y609_1942_USCGS, 2010-03-07,  JMS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE210,  ASH701945B_M,  CR619992805,  NONE, 1.2005, 1.2499, 15, 17815
 y609 Y609_1942_USCGS, 2010-03-08,  CHS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH701945E_M,  CR620022605,  NONE, 1.2592, 1.3079, 15, 163545