benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 gbrk, 2008-09-09,  ACalvert TSisson ,  USGS/Cascades Volcan,  TRIMBLE 4700,  220211200,  NP,  TRM41249.00,  60054886,  NONE, 0.3706, 0.4483, 30, 171630
 gbrk, 2008-09-10,  ACalvert TSisson ,  USGS/Cascades Volcan,  TRIMBLE 4700,  220211200,  NP,  TRM41249.00,  60054886,  NONE, 0.3706, 0.4483, 30, 30