benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 tuff, 1999-09-13,  CWW ,   ,  ASHTECH,  174 ,  Z-XII3 CD00,  ASH700936E_C,  CR16376,  NONE, 1.1619, 1.2117, 30, 155230
 tuff, 1999-09-25,  WRT ,   ,  ASHTECH,  188 ,  Z-XII3 CD00,  ASH700936E_C,  CR16364,  NONE, 1.2742, 1.3228, 30, 16730
 tuff, 2003-06-18,  SAH ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022602,  NONE, 1.338, 1.386, 30, 16150
 tuff Tuff_USGS, 2003-07-01,  MCN ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022601,  NONE, 1.341, 1.3889, 30, 164230
 tuff Tuff_USGS, 2008-09-12,  GDH ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII 1L00,  ASH701945E_M,  CR620022601,  NONE, 1.2218, 1.2709, 30, 1610
 tuff Tuff_USGS, 2008-09-17,  WRT ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945B_M,  CR519993703,  NONE, 1.1297, 1.18, 30, 17110
 tuff Tuff_USGS, 2013-09-10,  JLS ,  USGS ,  JAVAD,  00619 ,  TRE_G3TH SIGMA-Unkn,  ASH701945B_M,  CR519993703,  NONE, 1.1236, 1.1739, 15, 143815
 tuff Tuff_USGS, 2013-09-21,  WRT ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE210,  ASH701945E_M,  CR620022601,  NONE, 1.2086, 1.2579, 15, 162215