benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 CHLK, 1995-09-16,  unknown ,  unknown ,  TRIMBLE 4000ST,  339,  4.81,  TRM14532.00,  1300,  NONE, 0.9352, 0, 0, 16310
 chlk, 1996-07-09,  CHS ,  USGS ,  ASHTECH,  *LP00141 ,  Z-XII3 1F00,  ASH700718B,  11416,  NONE, 1.3812, 1.4288, 30, 15460
 chlk, 1996-07-16,  KAS ,  USGS ,  ASHTECH,  707 ,  Z-XII3 1F00,  ASH700718B,  11404,  NONE, 1.352, 1.3998, 30, 15180
 chlk Chalk_Bluff_1934_195, 2000-08-24,  GDH ,   ,  ASHTECH,  O4579 ,  Z-XII3 CC00,  ASH701945B_M,  CR519993702,  NONE, 1.2115, 1.2607, 30, 153830
 chlk Chalk_Bluff_1934_195, 2000-08-25,  GDH ,   ,  ASHTECH,  O4579 ,  Z-XII3 CC00,  ASH701945B_M,  CR519993702,  NONE, 1.2115, 1.2607, 30, 10
 chlk Chalk_Bluff_1934_195, 2000-08-26,  GDH ,   ,  ASHTECH,  O4579 ,  Z-XII3 CC00,  ASH701945B_M,  CR519993702,  NONE, 1.2115, 1.2607, 30, 10
 chlk Chalk_Bluff_1934_195, 2004-05-18,  GDH ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022605,  NONE, 1.2137, 1.2629, 30, 30
 chlk Chalk_Bluff_1934_195, 2004-05-19,  GDH ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022605,  NONE, 1.2137, 1.2629, 30, 30
 chlk Chalk_Bluff_1934_195, 2004-05-20,  GDH ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022605,  NONE, 1.2137, 1.2629, 30, 30