benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 rich Rich_1939_USC&GS, 1992-07-08,  JMS ,  USGS ,  ASHTECH,  765 ,  LM-XII3 7A24,  ASH700228D,  1058,  NONE, 1.3378, 1.3857, 30, 16540
 rich Rich_1939_USC&GS, 1992-07-09,  JMS ,  USGS ,  ASHTECH,  765 ,  LM-XII3 7A24,  ASH700228D,  1058,  NONE, 1.3378, 1.3857, 30, 235959.998
 rich Rich_1939_USC&GS, 1992-07-10,  JMS ,  USGS ,  ASHTECH,  765 ,  LM-XII3 7A24,  ASH700228D,  1058,  NONE, 1.3378, 1.3857, 30, 235959.991
 rich Rich_1939_USC&GS, 1996-08-30,  JEG ,  USGS ,  ASHTECH,  707 ,  Z-XII3 1F00,  ASH700718B,  11404,  NONE, 0.5934, 0.6562, 30, 720
 rich Rich_1939_USC&GS, 1998-01-29,  GDH ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 1E95,  ASH700936D_M,  CR14329,  NONE, 0.5128, 0.5795, 30, 181930
 rich Rich_1939_USC&GS, 1998-01-30,  JMS ,  USGS ,  ASHTECH,  O4591 ,  Z-XII3 1E95,  ASH700936D_M,  CR14329,  NONE, 0.5139, 0.5806, 30, 16550
 rich Rich_1939_USC&GS, 1999-10-22,  GDH ,  USGS ,  ASHTECH,  *LP00141 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 0.5308, 0.5966, 30, 172030
 rich Rich_1939_USC&GS, 1999-10-23,  GDH ,  USGS ,  ASHTECH,  *LP00141 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 0.5308, 0.5966, 30, 30
 rich Rich_1939_USC&GS, 1999-10-24,  GDH ,  USGS ,  ASHTECH,  *LP00141 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 0.5308, 0.5966, 30, 30
 rich Rich_1939_USC&GS, 1999-11-06,  GDH ,  USGS ,  ASHTECH,  LP00141 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 0.5371, 0.6025, 30, 165830
 rich Rich_1939_USC&GS, 1999-11-07,  GDH ,  USGS ,  ASHTECH,  LP00141 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 0.5371, 0.6025, 30, 30
 rich Rich_1939_USC&GS, 1999-11-19,  CHS ,   ,  ASHTECH,  lp019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.349, 1.3968, 30, 165530
 rich Rich_1939_USC&GS, 1999-11-20,  CHS ,   ,  ASHTECH,  lp019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.349, 1.3968, 30, 10
 rich Rich_1939_USC&GS, 1999-12-17,  JMS ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 CC00,  ASH700936D_M,  CR14333,  NONE, 0.577, 0.6406, 30, 172430
 rich Rich_1939_USC&GS, 1999-12-18,  JMS ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 CC00,  ASH700936D_M,  CR14333,  NONE, 0.577, 0.6406, 30, 10
 rich Rich_1939_USC&GS, 2000-01-22,  GDH ,  USGS-MenloPark ,  ASHTECH,  O4591 ,  Z-XII3 CC00,  ASH701945.02B,  CR619992805,  NONE, 0.5308, 0.5966, 30, 174130
 rich Rich_1939_USC&GS, 2000-01-23,  GDI ,  USGS-MenloPark ,  ASHTECH,  O4591 ,  Z-XII3 CC00,  ASH701945.02B,  CR619992805,  NONE, 0.5308, 0.5966, 30, 30
 rich Rich_1939_USC&GS, 2000-02-27,  CHS ,   ,  ASHTECH,  O4579 ,  Z-XII3 CC00,  ASH700936D_M,  CR14333,  NONE, 1.3611, 1.4088, 30, 16480
 rich Rich_1939_USC&GS, 2000-02-28,  CHS ,   ,  ASHTECH,  O4579 ,  Z-XII3 CC00,  ASH700936D_M,  CR14333,  NONE, 1.3611, 1.4088, 30, 10
 rich Rich_1939_USC&GS, 2000-05-05,  JMS ,   ,  ASHTECH,  O4597 ,  Z-XII3 CC00,  ASH700936D_M,  CR14330,  NONE, 0.5844, 0.6476, 30, 16300
 rich Rich_1939_USC&GS, 2000-05-06,  JMS ,   ,  ASHTECH,  O4597 ,  Z-XII3 CC00,  ASH700936D_M,  CR14330,  NONE, 0.5844, 0.6476, 30, 30
 rich Rich_1939_USC&GS, 2000-11-03,  GDH ,   ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH701945B_M,  CR519993703,  NONE, 0.5245, 0.5906, 30, 17220
 rich Rich_1939_USC&GS, 2000-11-04,  GDH ,   ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH701945B_M,  CR519993703,  NONE, 0.5245, 0.5906, 30, 30
 rich Rich_1939_USC&GS, 2001-04-24,  CHS ,   ,  ASHTECH,  lp019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.353, 1.4008, 30, 1620
 rich Rich_1939_USC&GS, 2001-04-25,  CHS ,   ,  ASHTECH,  lp019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.353, 1.4008, 30, 10
 rich Rich_1939_USC&GS, 2002-01-27,  JMS ,  USGS ,  ASHTECH,  04597 ,  Z-XII3 CC00,  ASH701945B_M,  CR619992801,  NONE, 0.6105, 0.6726, 30, 16520
 rich Rich_1939_USC&GS, 2002-01-28,  JMS ,  USGS ,  ASHTECH,  04597 ,  Z-XII3 CC00,  ASH701945B_M,  CR619992801,  NONE, 0.6105, 0.6726, 30, 10
 rich Rich_1939_USC&GS, 2003-02-27,  JLS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZC00,  ASH700936D_M,  CR14329,  NONE, 0.511, 0.5779, 30, 0
 rich Rich_1939_USC&GS, 2003-02-28,  JLS ,  USGS ,  ASHTECH,  ZE120023204 ,  Z-X ZC00,  ASH700936D_M,  CR14329,  NONE, 0.511, 0.5779, 30, 0
 rich Rich_1939_USC&GS, 2004-04-20,  CHS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE00,  ASH700936D_M,  CR14330,  NONE, 1.245, 1.2939, 30, 16580
 rich Rich_1939_USC&GS, 2004-04-21,  CHS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE00,  ASH700936D_M,  CR14330,  NONE, 1.245, 1.2939, 30, 0
 rich Rich_1939_USC&GS, 2004-04-22,  CHS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE00,  ASH700936D_M,  CR14330,  NONE, 1.245, 1.2939, 30, 0
 rich Rich_1939_USC&GS, 2004-04-23,  CHS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE00,  ASH700936D_M,  CR14330,  NONE, 1.245, 1.2939, 30, 0
 rich Rich_1939_USC&GS, 2006-03-14,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE21,  ASH700936D_M,  CR14329,  NONE, 0.5237, 0.5899, 30, 18120
 rich Rich_1939_USC&GS, 2006-03-15,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE21,  ASH700936D_M,  CR14329,  NONE, 0.5237, 0.5899, 30, 0
 rich Rich_1939_USC&GS, 2015-02-19,  ELP ,  USGS ,  JAVAD,  00598 ,  TRE_G3TH SIGMA3.3.1,  ASH701945E_M,  CR620022605,  NONE, 0.8284, 0.8839, 15, 183645
 rich Rich_1939_USC&GS, 2015-02-20,  ELP ,  USGS ,  JAVAD,  00598 ,  TRE_G3TH SIGMA3.3.1,  ASH701945E_M,  CR620022605,  NONE, 0.8284, 0.8839, 15, 0
 rich Rich_1939_USC&GS, 2015-02-21,  ELP ,  USGS ,  JAVAD,  00598 ,  TRE_G3TH SIGMA3.3.1,  ASH701945E_M,  CR620022605,  NONE, 0.8284, 0.8839, 15, 0