benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 spng Spangler_1933_USC&GS, 1994-03-18,  KWC ,  USGS ,  ASHTECH,  831 ,  LM-XII3 7A,  ASH700228A,  1027,  NONE, 0.5558, 0.6204, 30, 16270
 spng Spangler_1933_USC&GS, 2006-04-24,  JLS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945E_M,  CR520031615,  NONE, 0.5689, 0.6328, 30, 0
 spng Spangler_1933_USC&GS, 2006-04-25,  JLS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945E_M,  CR520031615,  NONE, 0.5689, 0.6328, 30, 0
 spng Spangler_1933_USC&GS, 2006-04-26,  JLS ,  USGS ,  ASHTECH,  ZE1200526028 ,  Z-X ZE21,  ASH701945E_M,  CR520031615,  NONE, 0.5689, 0.6328, 30, 0
 spng Spangler_1933_USC&GS, 2011-07-15,  JLS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 0.8386, 0.8938, 15, 172815
 spng Spangler_1933_USC&GS, 2011-07-16,  JLS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 0.8386, 0.8938, 15, 0
 spng Spangler_1933_USC&GS, 2011-07-17,  JLS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14333,  NONE, 0.8386, 0.8938, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-06,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 15310
 spng Spangler_1933_USC&GS, 2019-07-07,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-08,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-09,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-10,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-11,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-12,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-13,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-20,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 153945
 spng Spangler_1933_USC&GS, 2019-07-21,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-22,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-23,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-26,  JLS ,  USGS ,  JAVAD,  01659 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 1760
 spng Spangler_1933_USC&GS, 2019-07-27,  JLS ,  USGS ,  JAVAD,  01659 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-28,  JLS ,  USGS ,  JAVAD,  01659 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-07-29,  JLS ,  USGS ,  JAVAD,  01659 ,  TRE_G3TH SIGMA3.7.6,  ASH700936D_M,  CR14244,  NONE, 0.8243, 0.8798, 15, 0
 spng Spangler_1933_USC&GS, 2019-09-10,  ELP ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH701945E_M,  CR620022605,  NONE, 0.7966, 0.8528, 15, 141715
 spng Spangler_1933_USC&GS, 2019-09-11,  ELP ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH701945E_M,  CR620022605,  NONE, 0.7966, 0.8528, 15, 0
 spng Spangler_1933_USC&GS, 2019-09-12,  ELP ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH701945E_M,  CR620022605,  NONE, 0.7966, 0.8528, 15, 0
 spng Spangler_1933_USC&GS, 2019-09-13,  ELP ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH701945E_M,  CR620022605,  NONE, 0.7966, 0.8528, 15, 0
 spng Spangler_1933_USC&GS, 2019-09-14,  ELP ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.7.6,  ASH701945E_M,  CR620022605,  NONE, 0.7966, 0.8528, 15, 0
 spng Spangler_1933_USC&GS, 2020-10-20,  ELP ,  USGS ,  JAVAD,  01660 ,  TRE_G3TH SIGMA3.7.6,  JAVRINGANT_DM,  00457,  NONE, 0.7617, 0.8189, 15, 153530
 spng Spangler_1933_USC&GS, 2020-10-21,  ELP ,  USGS ,  JAVAD,  01660 ,  TRE_G3TH SIGMA3.7.6,  JAVRINGANT_DM,  00457,  NONE, 0.7617, 0.8189, 15, 0
 spng Spangler_1933_USC&GS, 2020-10-22,  ELP ,  USGS ,  JAVAD,  01660 ,  TRE_G3TH SIGMA3.7.6,  JAVRINGANT_DM,  00457,  NONE, 0.7617, 0.8189, 15, 0
 spng Spangler_1933_USC&GS, 2020-10-23,  ELP ,  USGS ,  JAVAD,  01660 ,  TRE_G3TH SIGMA3.7.6,  JAVRINGANT_DM,  00457,  NONE, 0.7617, 0.8189, 15, 0
 spng Spangler_1933_USC&GS, 2021-10-19,  ELP ,  USGS ,  JAVAD,  01337 ,  TRE_G3TH SIGMA3.7.6,  JAVRINGANT_DM,  00457,  NONE, 0.7977, 0.8539, 15, 153415
 spng Spangler_1933_USC&GS, 2021-10-20,  ELP ,  USGS ,  JAVAD,  01337 ,  TRE_G3TH SIGMA3.7.6,  JAVRINGANT_DM,  00457,  NONE, 0.7977, 0.8539, 15, 0
 spng Spangler_1933_USC&GS, 2021-10-21,  ELP ,  USGS ,  JAVAD,  01337 ,  TRE_G3TH SIGMA3.7.6,  JAVRINGANT_DM,  00457,  NONE, 0.7977, 0.8539, 15, 0