benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 ptab, 2008-09-08,  ACalvertTSisson ,  USGS/Cascades Volcan,  TRIMBLE 5700,  0220320193,  NP,  TRM41249.00,  60052133,  NONE, 0.8866, 0.9463, 15, 16450
 ptab, 2016-09-14,  SHERROD ,  USGS/Cascades Volcan,  JAVAD TRE_G3TH,  00483,  SIGMA3.6.6,  TRM41249.00,  M33787,  NONE, 1.0049, 1.0629, 15, 19380
 ptab, 2016-09-15,  SHERROD ,  USGS/Cascades Volcan,  JAVAD TRE_G3TH,  00483,  SIGMA3.6.6,  TRM41249.00,  M33787,  NONE, 1.0049, 1.0629, 15, 0