benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 mwlk, 2008-09-09,  STubman ,  USGS/Cascades Volcan,  TRIMBLE 4700,  220211182,  NP,  ASH700936E_C,  CR16291,  NONE, 1.1895, 1.239, 30, 195630
 mwlk, 2008-09-10,  STubman ,  USGS/Cascades Volcan,  TRIMBLE 4700,  220211182,  NP,  ASH700936E_C,  CR16291,  NONE, 1.1895, 1.239, 30, 30
 mwlk, 2016-08-09,  MEYERS ,  USGS/Cascades Volcan,  JAVAD TRE_G3TH,  00600,  SIGMA3.6.6,  TRM41249.00,  60121200,  NONE, 0.7162, 0.7793, 15, 2360
 mwlk, 2016-08-10,  MEYERS ,  USGS/Cascades Volcan,  JAVAD TRE_G3TH,  00600,  SIGMA3.6.6,  TRM41249.00,  60121200,  NONE, 0.7162, 0.7793, 15, 0