benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 hp21 HPGN_0201_1991_Cal_Tr, 1993-08-21,  GDH ,  USGS ,  ASHTECH LM-XII3,  99,  7A,  ASH700228D,  1036,  NONE, 1.4483, 1.4953, 30, 202530
 HPGN CALIF, 1998-08-10,  unknown ,  CALIF DEPT TRANSPORT,  TRIMBLE 4000,  1510,  SSE,  TRM22020.00+GP,  78882,  NONE, 1.889, 0, 15, 184645
 HPGN CALIF, 1998-08-11,  unknown ,  CALIF DEPT TRANSPORT,  TRIMBLE 4000,  1510,  SSE,  TRM22020.00+GP,  78882,  NONE, 1.889, 0, 15, 14320
 HPGN CALID, 1998-08-13,  unknown ,  CALIF DEPT TRANSPORT,  TRIMBLE 4000,  1510,  SSE,  TRM22020.00+GP,  78882,  NONE, 1.889, 0, 15, 194115
 SEIAD VALLEY, 2001-05-23,  UAF/HSU ,  UAF/HSU ,  TRIMBLE 4000SSI,  14634,  NP,  TRM22020.00+GP,  0,  NONE, 1.708, 0, 30, 61930
 hp21 HPGN_0201_1991_Cal_Tr, 2001-05-25,  UAF/HSU ,  UAF/HSU ,  TRIMBLE 4000SSI,  14634,  NP,  TRM22020.00+GP,  125576,  NONE, 1.8802, 0, 30, 14230
 hp21 HPGN_0201_1991_Cal_T, 2005-06-21,  JLS ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 0.4834, 0.5519, 30, 18520
 hp21 HPGN_0201_1991_Cal_T, 2005-06-22,  JLS ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 0.4834, 0.5519, 30, 30
 hp21 HPGN_0201_1991_Cal_T, 2005-06-23,  JLS ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14330,  NONE, 0.4834, 0.5519, 30, 30