benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 4jdd 4JD_1952_USGS, 1993-07-15,  KWC ,  USGS ,  ASHTECH LM-XII3,  107,  7A26,  ASH700228D,  *031,  NONE, 1.1849, 1.2345, 30, 232630
 4jdd 4JD_1952_USGS, 1992-08-11,  GDH ,  USGS ,  ASHTECH,  764 ,  LM-XII3 7A,  ASH700228A,  0598,  NONE, 1.1195, 1.1699, 30, 1900
 4JDD, 1994-07-31,  GDH ,  USGS ,  ASHTECH,  623 ,  L-XII 7A,  ASH700228A,  683,  NONE, 1.2342, 1.2832, 30, 14470
 4jdd 4JD_1952_USGS, 1996-07-19,  GDH ,  USGS ,  ASHTECH,  *LP00141 ,  Z-XII3 1F00,  ASH700718B,  11416,  NONE, 1.1267, 1.177, 30, 14530
 4jdd 4JD_1952_USGS, 1996-07-20,  CHS ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 1F00,  ASH700228D,  1036,  NONE, 1.2634, 1.3121, 30, 153830
 4jdd 4JD_1952_USGS, 1998-07-23,  JMS ,  USGS ,  ASHTECH,  O4579 ,  Z-XII3 1E95,  ASH700936D_M,  CR14329,  NONE, 1.1943, 1.2437, 30, 15450
 4jdd 4JD_1952_USGS, 1998-07-24,  GDH ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 1F50,  ASH700936E_C,  CR16379,  NONE, 1.1842, 1.2338, 30, 1580
 4jdd 4JD_1952_USGS, 1999-07-22,  CHS ,   ,  ASHTECH,  O4591 ,  Z-XII3 CC00,  ASH700936D_M,  CR14333,  NONE, 1.2449, 1.2938, 30, 15350
 4jdd 4JD_1952_USGS, 1999-07-23,  JLS ,   ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH701945B_M,  CR619992803,  NONE, 1.1336, 1.1838, 30, 154930
 4jdd 4JD_1952_USGS, 2002-07-13,  GDH ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993703,  NONE, 1.1529, 1.2029, 30, 153230
 4jdd 4JD_1952_USGS, 2002-07-14,  CHS ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992805,  NONE, 1.158, 1.2079, 30, 153430
 4jdd 4JD_1952_6818_USGS, 2005-07-24,  CHS ,  USGS ,  ASHTECH,  LP019992809 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.242, 1.2909, 30, 15300
 4jdd 4JD_1952_6818_USGS, 2005-07-25,  GDH ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH700936D_M,  CR14333,  NONE, 1.1529, 1.2029, 30, 155330
 4jdd 4JD_1952_6818_USGS, 2006-07-17,  CHS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE21,  ASH700936D_M,  CR14329,  NONE, 1.2238, 1.2729, 30, 15380
 4jdd 4JD_1952_6818_USGS, 2006-07-18,  GDH ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZE21,  ASH701945B_M,  CR619992801,  NONE, 1.159, 1.2089, 30, 15570
 4jdd 4JD_1952_6818_USGS, 2007-07-13,  CHS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII 1L00,  ASH701945B_M,  CR519993702,  NONE, 1.2329, 1.2819, 30, 15270
 4jdd 4JD_1952_6818_USGS, 2007-07-16,  CHS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE21,  ASH700936D_M,  CR14329,  NONE, 1.2703, 1.3189, 30, 15410
 4jdd 4JD_1952_6818_USGS, 2009-07-15,  CHS ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR520031626,  NONE, 1.1985, 1.2479, 30, 152230
 4jdd 4JD_1952_6818_USGS, 2009-07-16,  JLS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII 1L001,  ASH701945B_M,  CR619992801,  NONE, 1.1529, 1.2029, 30, 135330
 4jdd 4JD_1952_6818_USGS, 2011-08-10,  CHS ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII 1L001,  ASH700936D_M,  CR14341,  NONE, 1.2339, 1.2829, 15, 154945
 4jdd 4JD_1952_6818_USGS, 2011-08-13,  CHS ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII 1L001,  ASH700936D_M,  CR14341,  NONE, 1.1894, 1.2389, 15, 16345