benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 efrk, 2000-07-04,  TAB ,  USC ,  ASHTECH Z-XII3,  188,  CD00,  ASH700936E_C,  CR16376,  NONE, 1.0999, 1.1505, 30, 16100
 efrk, 2000-07-05,  TSB ,  USC ,  ASHTECH Z-XII3,  319,  CC00,  ASH701945B_M,  CR519991756,  NONE, 1.1299, 1.1801, 30, 16130
 efrk, 2000-07-09,  MPP ,  USC ,  ASHTECH Z-XII3,  188,  CD00,  ASH700936E_C,  CR16376,  NONE, 0.9022, 0.9561, 30, 1820
 efrk, 2001-07-31,  SEO ,  USC ,  ASHTECH Z-XII3,  317,  CC00,  ASH700936E_C,  CR16404,  NONE, 0.6525, 0.713, 30, 171330
 efrk, 2001-08-03,  IEC ,  USC ,  ASHTECH Z-XII3,  174,  CD00,  ASH700936E_C,  CR16381,  NONE, 1.0164, 1.0683, 30, 164030
 efrk, 2002-07-22,  IEC ,  USC ,  ASHTECH Z-XII3,  174,  CD00,  ASH700936E_C,  CR16379,  NONE, 0.9601, 1.0129, 30, 16320
 efrk, 2002-07-23,  IEC ,  USC ,  ASHTECH Z-XII3,  174,  CD00,  ASH700936E_C,  379,  NONE, 1.1109, 1.1614, 30, 15470
 efrk, 2015-04-14,  SKW ,  USGS ,  TRIMBLE 5700,  0220316023,  2.01,  TRM41249.00,  60142391,  NONE, 0.8029, 0.8641, 15, 30
 efrk, 2010-05-06,  JMS ,  USGS ,  TRIMBLE,  0220320193 ,  5700 NP,  TRM41249.00,  60249097,  NONE, 0.5603, 0.628, 15, 30
 efrk, 2010-05-07,  JMS ,  USGS ,  TRIMBLE,  0220320193 ,  5700 NP,  TRM41249.00,  60249097,  NONE, 0.5603, 0.628, 15, 30
 efrk, 2012-07-10,  CalVO ,  USGS ,  JAVAD,  00620 ,  TRE_G3TH SIGMA3.3.1,  ASH701945B_M,  CR519993706,  NONE, 1.0619, 1.1131, 15, 0
 efrk, 2012-07-11,  CalVO ,  USGS ,  JAVAD,  00620 ,  TRE_G3TH SIGMA3.3.1,  ASH701945B_M,  CR519993706,  NONE, 1.0619, 1.1131, 15, 0
 efrk, 2015-04-11,  SKW ,  USGS ,  TRIMBLE,  0220316023 ,  5700 2.01,  TRM41249.00,  60142391,  NONE, 0.8029, 0.8641, 15, 184830
 efrk, 2015-04-12,  SKW ,  USGS ,  TRIMBLE,  0220316023 ,  5700 2.01,  TRM41249.00,  60142391,  NONE, 0.8029, 0.8641, 15, 30
 efrk, 2015-04-13,  SKW ,  USGS ,  TRIMBLE,  0220316023 ,  5700 2.01,  TRM41249.00,  60142391,  NONE, 0.8029, 0.8641, 15, 30
 efrk, 2017-06-30,  EMB ,  USGS ,  JAVAD,  01328 ,  TRE_G3TH SIGMA3.5.1,  TRM41249.00,  60073616,  NONE, 0.6481, 0.7129, 15, 233345
 efrk, 2017-07-01,  EMB ,  USGS ,  JAVAD,  01328 ,  TRE_G3TH SIGMA3.5.1,  TRM41249.00,  60073616,  NONE, 0.6481, 0.7129, 15, 0