benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 ld60, 1994-06-08,  unknown ,  NGS ,  TRIMBLE 4000SST,  333,  4.81,  TRM14532.00,  137,  NONE, 0.825, 0, 15, 1890
 ld60, 1994-06-10,  unknown ,  NGS ,  TRIMBLE 4000SST,  333,  4.81,  TRM14532.00,  137,  NONE, 0.817, 0, 15, 142630
 ld60 LDW60_1974_USGS, 2006-07-21,  CHS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE21,  ASH701945E_M,  CR520031622,  NONE, 1.1742, 1.2239, 30, 161930
 ld60 LDW60_1974_USGS, 2006-07-26,  JLS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE21,  ASH701945E_M,  CR520031615,  NONE, 1.1793, 1.2289, 30, 134630