benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 hold Holde_1949_USC&GS, 1994-11-18,  JMS ,  USGS ,  ASHTECH,  O4591 ,  Z-XII3 1E00,  ASH700228D,  1058,  NONE, 1.2564, 1.3052, 30, 14560
 hold Holde_1949_USC&GS, 1994-11-19,  JMS ,  USGS ,  ASHTECH,  O4591 ,  Z-XII3 1E00,  ASH700228D,  1058,  NONE, 1.2272, 1.2763, 30, 23590
 hold Holde_1949_USC&GS, 1996-02-11,  CHS ,  USGS ,  ASHTECH,  143 ,  Z-XII3 1F00,  ASH700718B,  11401,  NONE, 1.3177, 1.3658, 30, 200
 hold Holde_1949_USC&GS, 1996-02-18,  JMS ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 1F00,  ASH700228D,  1036,  NONE, 1.2463, 1.2952, 30, 2330
 hold Holde_1949_USC&GS, 1997-10-29,  CHS ,  USGS ,  ASHTECH,  O4597 ,  Z-XII3 1E95,  ASH700936D_M,  CR14244,  NONE, 1.3389, 1.3869, 30, 110
 hold Holde_1949_USC&GS, 1997-11-04,  JMS ,  USGS ,  ASHTECH,  4600 ,  Z-XII3 1E95,  ASH700936D_M,  CR14329,  NONE, 1.2975, 1.3458, 30, 17030
 hold Holde_1949_USC&GS, 1999-04-19,  GDH ,  USGS ,  ASHTECH,  O4597 ,  Z-XII3 CB00,  ASH700936D_M,  CR14244,  NONE, 1.2409, 1.2898, 30, 15460
 hold Holde_1949_USC&GS, 1999-04-20,  CHS ,  USGS ,  ASHTECH,  LP03464 ,  Z-XII3 CB00,  ASH700936D_M,  CR14341,  NONE, 1.2884, 1.3368, 30, 153330
 hold Holde_1949_USC&GS, 2003-06-07,  JLS ,  USGS ,  ASHTECH,  LP019992809 ,  Z-XII3 CD00,  ASH700936D_M,  CR14333,  NONE, 1.1752, 1.2249, 30, 155515
 hold Holde_1949_USC&GS, 2003-06-10,  CHS ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH700936D_M,  CR14329,  NONE, 1.2369, 1.2859, 30, 152530
 hold Holde_1949_USC&GS, 2014-03-16,  JLS ,  USGS ,  JAVAD,  00618 ,  TRE_G3TH SIGMA3.3.1,  ASH701945E_M,  CR520031622,  NONE, 0.6627, 0.7229, 15, 182315
 hold Holde_1949_USC&GS, 2014-03-17,  JLS ,  USGS ,  JAVAD,  00618 ,  TRE_G3TH SIGMA3.3.1,  ASH701945E_M,  CR520031622,  NONE, 0.6627, 0.7229, 15, 0
 hold Holde_1949_USC&GS, 2014-03-18,  JLS ,  USGS ,  JAVAD,  00618 ,  TRE_G3TH SIGMA3.3.1,  ASH701945E_M,  CR520031622,  NONE, 0.6627, 0.7229, 15, 0
 hold Holde_1949_USC&GS, 2021-06-12,  JLS ,  USGS ,  JAVAD,  00598 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.6409, 0.7019, 15, 144930
 hold Holde_1949_USC&GS, 2021-06-13,  JLS ,  USGS ,  JAVAD,  00598 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.6409, 0.7019, 15, 0