benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 r931, 2000-09-12,  WRT ,  USGS ,  ASHTECH,  lp019992805 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993703,  NONE, 1.3812, 1.4288, 30, 1630
 r931, 2000-09-25,  CWW ,   ,  ASHTECH,  203 ,  Z-XII3 CD00,  ASH700936E_C,  CR16364,  NONE, 1.3883, 1.4358, 30, 15190
 r931 R931_stmpd_RCE_29951, 2009-09-19,  WRT ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE210,  ASH700936D_M,  CR14341,  NONE, 1.2288, 1.2778, 30, 154130
 r931 R931_stmpd_RCE_29951, 2009-11-13,  JMS ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 1.5033, 1.5499, 30, 165045