benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 airr Air_1990_USGS, 1992-02-11,  KWC ,  USGS ,  ASHTECH,  0831 ,  LM-XII3 5F,  ASH700228A,  0616,  NONE, 1.2493, 1.2981, 30, 630
 airr Air_1990_USGS, 1992-02-12,  CHS ,  USGS ,  ASHTECH,  762 ,  LM-XII3 6A,  ASH700228A,  0745,  NONE, 1.376, 1.4236, 30, 7230
 airr Air_1990_USGS, 1993-01-13,  KWC ,  USGS ,  ASHTECH,  0831 ,  LM-XII3 6M24,  ASH700228A,  1027,  NONE, 1.2875, 1.336, 30, 12030
 airr Air_1990_USGS, 1993-01-14,  CHS ,  USGS ,  ASHTECH,  107 ,  LM-XII3 6M24,  ASH700228D,  *031,  NONE, 1.3438, 1.3917, 30, 1230
 airr Air_1990_USGS, 1994-04-19,  GDH ,  USGS ,  ASHTECH,  831 ,  LM-XII3 7A,  ASH700228A,  1027,  NONE, 1.3308, 1.3788, 30, 14830
 airr Air_1990_USGS, 1995-09-20,  GDH ,  USGS ,  ASHTECH,  707 ,  Z-XII3 1E24,  ASH700718B,  11404,  NONE, 1.2564, 1.3052, 30, 16130
 airr Air_1990_USGS, 1996-10-29,  JMS ,  USGS ,  ASHTECH,  *LP00141 ,  Z-XII3 1F00,  ASH700718B,  11416,  NONE, 1.2955, 1.3439, 30, 161030
 airr Air_1990_USGS, 1997-11-18,  CHS ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 1E95,  ASH700936D_M,  CR14244,  NONE, 1.2975, 1.3458, 30, 1620
 airr Air_1990_USGS, 1997-12-02,  GDH ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 1E95,  ASH700936D_M,  CR14244,  NONE, 1.3166, 1.3648, 30, 155930
 airr Air_1990_USGS, 1998-12-01,  GDH ,  USGS ,  ASHTECH,  O4597 ,  Z-XII3 CB00,  ASH700936E_C,  CR16376,  NONE, 1.3358, 1.3837, 30, 15550
 airr Air_1990_USGS, 1998-12-08,  JMS ,  USGS ,  ASHTECH,  O4579 ,  Z-XII3 CB00,  ASH700936E_C,  CR16376,  NONE, 1.4004, 1.4478, 30, 15460
 airr Air_1990_USGS, 2001-02-07,  CHS ,   ,  ASHTECH,  4600 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.2954, 1.3438, 30, 163230
 airr Air_1990_USGS, 2001-02-08,  CHS ,   ,  ASHTECH,  4600 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993702,  NONE, 1.2954, 1.3438, 30, 10
 airr Air_1990_USGS, 2003-02-03,  CHS ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 1.344, 1.3919, 30, 15580
 airr Air_1990_USGS, 2003-02-04,  CHS ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 1.344, 1.3919, 30, 10
 airr Air_1990_USGS, 2006-02-01,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH700936D_M,  CR14330,  NONE, 1.4046, 1.4519, 30, 0
 airr Air_1990_USGS, 2006-02-02,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH700936D_M,  CR14330,  NONE, 1.4046, 1.4519, 30, 0