benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 mk11 MK11_USGS, 2015-10-22,  SKW ,  USGS ,  JAVAD TRE_G3TH,  00470,  SIGMA-Unknown-,  TRM41249.00,  60194583,  NONE, 0.5458, 0.6141, 15, 0
 mk11 MK11_USGS, 2013-07-13,  JLS ,  USGS ,  JAVAD,  00588 ,  TRE_G3TH SIGMA3.3.1,  ASH701945E_M,  CR620022601,  NONE, 1.1843, 1.2338, 15, 133345
 mk11 mk11_USGS_replacemen, 2013-07-14,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14341,  NONE, 0.8571, 0.9119, 15, 16815
 mk11 MK11_USGS, 2015-10-20,  SKW ,  USGS ,  JAVAD,  00470 ,  TRE_G3TH SIGMA-Unkn,  TRM41249.00,  60194583,  NONE, 0.5458, 0.6141, 15, 0
 mk11 MK11_USGS, 2015-10-21,  SKW ,  USGS ,  JAVAD,  00470 ,  TRE_G3TH SIGMA-Unkn,  TRM41249.00,  60194583,  NONE, 0.5458, 0.6141, 15, 0