benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 colu Columbia_1950_USCGS, 1995-03-23,  JMS ,  USGS ,  ASHTECH,  831 ,  LM-XII3 7A,  ASH700228A,  1027,  NONE, 1.1819, 1.2315, 30, 15560
 colu Columbia_1950_USCGS, 1995-03-24,  CHS ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 1E00,  ASH700228A,  0745,  NONE, 1.2433, 1.2922, 30, 161530
 colu Columbia_1950_USCGS, 1995-03-25,  GDH ,  USGS ,  ASHTECH,  O4591 ,  Z-XII3 1E00,  ASH700228D,  1058,  NONE, 1.1849, 1.2345, 30, 155730
 colu Columbia_1950_USCGS, 1996-02-13,  GDH ,  USGS ,  ASHTECH,  707 ,  Z-XII3 1F00,  ASH700718B,  11404,  NONE, 1.2076, 1.2569, 30, 16540
 colu Columbia_1950_USCGS, 1996-02-15,  GDH ,  USGS ,  ASHTECH,  *LP00141 ,  Z-XII3 1F00,  ASH700718B,  11416,  NONE, 1.1925, 1.242, 30, 16470
 colu Columbia_1950_USCGS, 1997-11-01,  GDH ,  USGS ,  ASHTECH,  O4591 ,  Z-XII3 1E95,  ASH700936D_M,  CR14330,  NONE, 1.2115, 1.2607, 30, 165930
 colu Columbia_1950_USCGS, 1997-11-02,  GDH ,  USGS ,  ASHTECH,  O4591 ,  Z-XII3 1E95,  ASH700936D_M,  CR14330,  NONE, 1.2115, 1.2607, 30, 30
 colu Columbia_1950_USCGS, 1997-11-03,  GDH ,  USGS ,  ASHTECH,  O4591 ,  Z-XII3 1E95,  ASH700936D_M,  CR14330,  NONE, 1.2115, 1.2607, 30, 30
 colu Columbia_1950_USCGS, 1999-04-23,  JLS ,  USGS ,  ASHTECH,  O4582 ,  Z-XII3 CB00,  ASH700936D_M,  CR14244,  NONE, 1.1153, 1.1657, 30, 1240
 colu Columbia_1950_USCGS, 1999-04-24,  JLS ,  USGS ,  ASHTECH,  O4582 ,  Z-XII3 CB00,  ASH700936D_M,  CR14244,  NONE, 1.1153, 1.1657, 30, 10
 colu Columbia_1950_USCGS, 2002-06-08,  CHS ,  USGS ,  ASHTECH,  04597 ,  Z-XII3 CC00,  ASH701945B_M,  CR619992805,  NONE, 1.1732, 1.2229, 30, 14410
 colu Columbia_1950_USCGS, 2002-06-09,  CHS ,  USGS ,  ASHTECH,  04597 ,  Z-XII3 CC00,  ASH701945B_M,  CR619992805,  NONE, 1.1732, 1.2229, 30, 10