benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 gull Gull_1985_USGS, 2015-02-17,  SKW ,  USGS ,  TRIMBLE 5700,  0220320138,  2.01,  TRM41249.00,  60194583,  NONE, 0.7538, 0.816, 15, 231230
 gull Gull_1985_USGS, 2015-02-21,  SKW ,  USGS ,  TRIMBLE 5700,  0220320138,  2.01,  TRM41249.00,  60194583,  NONE, 0.7538, 0.816, 15, 30
 gull Gull_1985_USGS, 1998-07-23,  ECB ,  USGS ,  ASHTECH,  188 ,  Z-XII3 1F50,  ASH700936E_C,  CR16376,  NONE, 1.4901, 1.5368, 30, 15140
 gull Gull_1985_USGS, 1998-07-24,  JLS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CB00,  ASH700936D_M,  CR14330,  NONE, 1.1427, 1.1928, 30, 15500
 gull Gull_1985_USGS, 1999-07-22,  GDH ,   ,  ASHTECH,  203 ,  Z-XII3 1F50,  ASH700936E_C,  CR16379,  NONE, 1.258, 1.3067, 30, 1670
 gull Gull_1985_USGS, 1999-07-23,  RBG ,   ,  ASHTECH,  4600 ,  Z-XII3 CC00,  ASH700936D_M,  CR14341,  NONE, 1.2206, 1.2698, 30, 15290
 gull Gull_1985_USGS, 2002-07-12,  CWA ,  USGS ,  ASHTECH,  04600 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993706,  NONE, 1.2693, 1.3179, 30, 164630
 gull Gull_1985_USGS, 2002-07-15,  JLS ,  USGS ,  ASHTECH,  LP03174 ,  Z-XII3 CD00,  ASH700936E_C,  CR16379,  NONE, 1.1671, 1.2169, 30, 153030
 gull Gull_1985_USGS, 2005-07-24,  GDH ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH700936D_M,  CR14333,  NONE, 1.1732, 1.2229, 30, 155430
 gull Gull_1985_USGS, 2005-07-26,  JMS ,  USGS ,  ASHTECH,  ZE120033802 ,  Z-X ZE21,  ASH701945E_M,  CR520031626,  NONE, 1.3541, 1.4019, 30, 1600
 gull Gull_1985_USGS, 2007-07-21,  JMS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945B_M,  CR619992805,  NONE, 0.6885, 0.7478, 30, 151030
 gull Gull_1985_USGS, 2007-07-24,  GDH ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE21,  ASH700936D_M,  CR14330,  NONE, 0.5532, 0.6178, 30, 165630
 gull Gull_1985_USGS, 2009-07-17,  JMS ,  USGS ,  ASHTECH,  579 ,  Z-XII 1L001,  ASH700936D_M,  CR14330,  NONE, 1.4025, 1.4499, 30, 16630
 gull Gull_1985_USGS, 2009-07-19,  CHS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR620022602,  NONE, 1.2208, 1.27, 30, 154930
 gull Gull_1985_USGS, 2011-08-11,  CHS ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII 1L001,  ASH700936D_M,  CR14341,  NONE, 1.4882, 1.5349, 15, 154445
 gull Gull_1985_USGS, 2011-08-12,  CHS ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII 1L001,  ASH700936D_M,  CR14341,  NONE, 1.1712, 1.2209, 15, 153745
 gull Gull_1985_USGS, 2013-07-10,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE210,  ASH700936D_M,  CR14341,  NONE, 1.3925, 1.44, 15, 16115
 gull Gull_1985_USGS, 2013-07-11,  JLS ,  USGS ,  JAVAD,  00620 ,  TRE_G3TH SIGMA3.3.1,  ASH701945B_M,  CR519993703,  NONE, 1.2076, 1.2569, 15, 134615
 gull Gull_1985_USGS, 2015-02-18,  SKW ,  USGS ,  TRIMBLE,  0220320138 ,  5700 2.01,  TRM41249.00,  60194583,  NONE, 0.7538, 0.816, 15, 30
 gull Gull_1985_USGS, 2015-02-19,  SKW ,  USGS ,  TRIMBLE,  0220320138 ,  5700 2.01,  TRM41249.00,  60194583,  NONE, 0.7538, 0.816, 15, 30
 gull Gull_1985_USGS, 2015-02-20,  SKW ,  USGS ,  TRIMBLE,  0220320138 ,  5700 2.01,  TRM41249.00,  60194583,  NONE, 0.7538, 0.816, 15, 30