benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 snds Sand_Springs_1935_US, 1994-07-07,  KWC ,  USGS ,  ASHTECH,  764 ,  LM-XII3 7A,  ASH700228A,  0598,  NONE, 0.4651, 0.5347, 30, 17430
 snds Sand_Springs_1935_US, 2000-08-18,  GDH ,   ,  ASHTECH,  O4591 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 0.5096, 0.5765, 30, 10
 snds Sand_Springs_1935_US, 2004-05-17,  JMS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-X ZE00,  ASH701945E_M,  CR520031622,  NONE, 0.4599, 0.5299, 30, 0
 snds Sand_Springs_1935_US, 2004-05-18,  JMS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-X ZE00,  ASH701945E_M,  CR520031622,  NONE, 0.4599, 0.5299, 30, 0
 snds Sand_Springs_1935_US, 2004-05-19,  JMS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-X ZE00,  ASH701945E_M,  CR520031622,  NONE, 0.4599, 0.5299, 30, 0