benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 p229 P_229_1935_USC&GS, 1992-06-11,  CHS ,  USGS ,  ASHTECH,  099 ,  LM-XII3 7A24,  ASH700228D,  1036,  NONE, 1.3569, 1.4047, 30, 130
 p229 P_229_1935_USC&GS, 1992-06-12,  MHM ,  USGS ,  ASHTECH,  2105 ,  LM-XII3 6GP4,  ASH700228A,  1675,  NONE, 1.3991, 1.4465, 3, 5343
 p229 P_229_1935_USC&GS, 1994-04-29,  MHM ,  USGS ,  ASHTECH,  827 ,  Z-XII3 1C01,  ASH700228A,  *104,  NONE, 1.3087, 1.3569, 30, 173330
 p229 P_229_1935_USC&GS, 1994-09-14,  CHS ,  USGS ,  ASHTECH,  762 ,  LM-XII3 7A,  ASH700228A,  0745,  NONE, 1.4915, 1.5382, 30, 15230
 p229 P_229_1935_USC&GS, 2001-07-13,  CHS ,   ,  ASHTECH,  lp019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14329,  NONE, 1.476, 1.5228, 30, 162430
 p229 P_229_1935_USC&GS, 2001-07-14,  JLS ,   ,  ASHTECH,  4600 ,  Z-XII3 CD00,  ASH700936D_M,  CR14333,  NONE, 1.3086, 1.3568, 30, 16150
 p229 P_229_1935_USC&GS, 2004-07-17,  JLS ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CD00,  ASH700936D_M,  CR14244,  NONE, 1.3228, 1.3709, 30, 16230