benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 1pdi 1_PDI_1986_USGS, 1993-04-30,  GDH ,  USGS ,  ASHTECH,  765 ,  LM-XII3 6M24,  ASH700228D,  1058,  NONE, 1.4864, 1.5331, 30, 29
 1pdi 1_PDI_1986_USGS, 1993-05-01,  GDH ,  USGS ,  ASHTECH,  765 ,  LM-XII3 6M24,  ASH700228D,  1058,  NONE, 1.4864, 1.5331, 30, 29
 1pdi 1_PDI_1986_USGS, 1993-05-02,  CHS ,  USGS ,  ASHTECH,  765 ,  LM-XII3 6M24,  ASH700228D,  1058,  NONE, 1.4864, 1.5331, 30, 0
 1pdi 1_PDI_1986_USGS, 1993-05-06,  WKG ,  USGS ,  ASHTECH,  762 ,  LM-XII3 6M24,  ASH700228A,  0745,  NONE, 1.3247, 1.3728, 30, 3030
 1pdi 1_PDI_1986_USGS, 1993-07-24,  CHS ,  USGS ,  ASHTECH,  107 ,  LM-XII3 7A26,  ASH700228D,  *031,  NONE, 1.3177, 1.3658, 30, 17420
 1pdi, 1994-11-17,  WKG ,  USGS ,  ASHTECH,  831 ,  LM-XII3 7A,  ASH700228A,  1027,  NONE, 1.2895, 1.3379, 30, 15400
 1pdi 1_PDI_1986_USGS, 1996-02-11,  JMS ,  USGS ,  ASHTECH,  O4582 ,  Z-XII3 1F00,  ASH700228D,  1068,  NONE, 1.2503, 1.2991, 30, 17220
 1pdi 1_PDI_1986_USGS, 1996-02-12,  JMS ,  USGS ,  ASHTECH,  O4582 ,  Z-XII3 1F00,  ASH700228D,  1068,  NONE, 1.2503, 1.2991, 30, 29.966
 1pdi 1_PDI_1986_USGS, 1997-10-29,  JMS ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 1E95,  ASH700936D_M,  CR14333,  NONE, 1.4428, 1.4898, 30, 17520
 1pdi 1_PDI_1986_USGS, 1997-10-30,  JMS ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 1E95,  ASH700936D_M,  CR14333,  NONE, 1.4428, 1.4898, 30, 10
 1pdi 1_PDI_1986_USGS, 1997-10-31,  JMS ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 1E95,  ASH700936D_M,  CR14333,  NONE, 1.4428, 1.4898, 30, 10
 1pdi 1_PDI_1986_USGS, 1998-06-07,  CHS ,   ,  ASHTECH,  O4579 ,  Z-XII3 1E95,  ASH700936D_M,  CR14329,  NONE, 1.2873, 1.3357, 30, 18320
 1pdi 1_PDI_1986_USGS, 1998-06-08,  CHS ,  USGS ,  ASHTECH,  O4579 ,  Z-XII3 1E95,  ASH700936D_M,  CR14329,  NONE, 1.2873, 1.3357, 30, 30
 1pdi 1_PDI_1986_USGS, 1998-06-09,  CHS ,  USGS ,  ASHTECH,  O4579 ,  Z-XII3 1E95,  ASH700936D_M,  CR14329,  NONE, 1.2873, 1.3357, 30, 30
 1pdi 1_PDI_1986_USGS, 1999-04-22,  CHS ,  USGS ,  ASHTECH,  LP03450 ,  Z-XII3 CB00,  ASH700936D_M,  CR14333,  NONE, 1.3843, 1.4318, 30, 10
 1pdi 1_PDI_1986_USGS, 2003-06-09,  JMS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH700936D_M,  CR14330,  NONE, 0.549, 0.6139, 30, 174230
 1pdi 1_PDI_1986_USGS, 2003-06-10,  JMS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH700936D_M,  CR14330,  NONE, 0.549, 0.6139, 30, 10
 1pdi 1_PDI_1986_USGS, 2003-06-11,  JMS ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 CC00,  ASH700936D_M,  CR14330,  NONE, 0.549, 0.6139, 30, 10