benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 sl20, 1999-09-18,  CHS ,   ,  ASHTECH,  O4579 ,  Z-XII3 CC00,  ASH700936D_M,  CR14329,  NONE, 1.2105, 1.2598, 30, 15530
 sl20, 1999-09-28,  JMS ,   ,  ASHTECH,  O4582 ,  Z-XII3 CC00,  ASH700936D_M,  CR14330,  NONE, 0.4067, 0.4805, 30, 155830
 sl20 SL20_USGS_plug, 2003-06-22,  JMS ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992805,  NONE, 1.1428, 1.1929, 30, 162830
 sl20 SL20_USGS_plug, 2003-06-23,  JMS ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992805,  NONE, 1.1428, 1.1929, 30, 10
 sl20 SL20_USGS_plug, 2003-06-24,  JMS ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992805,  NONE, 1.1428, 1.1929, 30, 10
 sl20 SL20_USGS_plug, 2008-10-22,  BP ,  USGS/Cascades Volcan,  TRIMBLE,  0220264600 ,  5700 NP,  TRM41249.00,  60142391,  NONE, 0.7671, 0.829, 15, 161530
 sl20 SL20_USGS_plug, 2008-10-23,  BP ,  USGS/Cascades Volcan,  TRIMBLE,  0220264600 ,  5700 NP,  TRM41249.00,  60142391,  NONE, 0.7671, 0.829, 15, 30
 sl20 SL20_USGS_plug, 2008-10-24,  BP ,  USGS/Cascades Volcan,  TRIMBLE,  0220264600 ,  5700 NP,  TRM41249.00,  60142391,  NONE, 0.7671, 0.829, 15, 30
 sl20 SL20_USGS_plug, 2014-09-12,  SAH ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE210,  ASH701945E_M,  CR620022602,  NONE, 1.1853, 1.2349, 15, 16815
 sl20 SL20_USGS_plug, 2014-10-23,  JLS ,  USGS ,  JAVAD,  00620 ,  TRE_G3TH SIGMA3.3.1,  ASH700936D_M,  CR14341,  NONE, 1.239, 1.2879, 15, 153545