benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 rlns, 2001-09-15,  TD ,  USGS ,  TRIMBLE,  3608A14632 ,  4000SSI NP,  TRM29659.00,  0220089288,  NONE, 1.4111, 0, 0, 154730
 rlns, 2001-09-22,  WRT ,   ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH700936D_M,  CR14330,  NONE, 1.471, 1.5178, 30, 16530
 rlns R_USGS_NEHRP, 2005-09-24,  WRT ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022605,  NONE, 1.1884, 1.2379, 30, 30
 rlns R_USGS_NEHRP, 2012-09-14,  JMS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE210,  ASH701945E_M,  CR520031622,  NONE, 0.7597, 0.8169, 15, 0
 rlns R_USGS_NEHRP, 2012-09-15,  JMS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE210,  ASH701945E_M,  CR520031622,  NONE, 0.7597, 0.8169, 15, 0