benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 prce Pierce_Ecc_1981_NCER, 1993-08-18,  GDH ,  USGS ,  ASHTECH LM-XII3,  1104,  7A26,  ASH700228D,  1068,  NONE, 1.2754, 1.324, 30, 195630
 pier Mt_Pierce_2_1926, 1994-04-29,  MHM ,  USGS ,  ASHTECH LM-XII3,  283,  7A,  unknown,  *234,  NONE, 1.1416, 0, 30, 18290
 pier Mt_Pierce_2_1926, 1994-04-30,  MHM ,  USGS ,  ASHTECH LM-XII3,  283,  7A,  unknown,  *234,  NONE, 1.1416, 0, 30, 0
 prce Pierce_Ecc_1981_NCER, 1994-09-17,  KWC ,  USGS ,  ASHTECH LM-XII3,  765,  7A,  ASH700228D,  1058,  NONE, 1.2091, 1.2584, 30, 0
 prce Pierce_Ecc_1981_NCER, 1992-05-06,  KWC ,  USGS ,  ASHTECH,  0831 ,  LM-XII3 5F,  ASH700228A,  0616,  NONE, 1.3087, 1.3569, 30, 12230
 prce Pierce_Ecc_1981_NCER, 1992-05-07,  KWC ,  USGS ,  ASHTECH,  0831 ,  LM-XII3 5F,  ASH700228A,  0616,  NONE, 1.2815, 1.33, 30, 1450
 prce Pierce_Ecc_1981_NCER, 1992-06-13,  CHS ,  USGS ,  ASHTECH,  099 ,  LM-XII3 7A24,  ASH700228D,  1036,  NONE, 1.2744, 1.323, 3, 133
 prce Pierce_Ecc_1981_NCER, 1994-08-24,  GDH ,  USGS ,  ASHTECH,  831 ,  LM-XII3 7A,  ASH700228A,  1027,  NONE, 1.369, 1.4167, 30, 15330
 prce Pierce_Ecc_1981_NCER, 1994-09-16,  KWC ,  USGS ,  ASHTECH,  765 ,  LM-XII3 7A,  ASH700228D,  1058,  NONE, 1.2091, 1.2584, 30, 153130
 prce Pierce_Ecc_1981_NCER, 2001-07-12,  CHS ,   ,  ASHTECH,  lp019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.1447, 1.1947, 30, 161330
 prce Pierce_Ecc_1981_NCER, 2001-07-13,  CHS ,   ,  ASHTECH,  lp019992803 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.1447, 1.1947, 30, 10
 prce Pierce_Ecc_1981_NCER, 2004-07-19,  JMS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031626,  NONE, 1.3349, 1.3829, 30, 17930
 prce Pierce_Ecc_1981_NCER, 2004-07-20,  JMS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031626,  NONE, 1.3349, 1.3829, 30, 30
 prce Pierce_Ecc_1981_NCER, 2004-07-21,  JMS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031626,  NONE, 1.3349, 1.3829, 30, 30
 prce Pierce_Ecc_1981_NCER, 2004-07-22,  JMS ,  USGS ,  ASHTECH,  LP020000801 ,  Z-XII3 CD00,  ASH701945E_M,  CR520031626,  NONE, 1.3349, 1.3829, 30, 30