benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 x423, 2003-09-09,  MAJ ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII3 CD00,  ASH700936D_M,  CR14341,  NONE, 1.1469, 1.1969, 30, 1820
 x423, 2003-09-10,  MRF ,  USGS ,  ASHTECH,  04597 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993703,  NONE, 1.3107, 1.3589, 30, 16390
 x423 X423_1984_NGS, 2007-09-06,  GDH ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE21,  ASH700936D_M,  CR14244,  NONE, 0.6471, 0.7078, 30, 153330
 x423 X423_1984_NGS, 2007-09-07,  GDH ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE21,  ASH700936D_M,  CR14244,  NONE, 0.6471, 0.7078, 30, 0
 x423 X423_1984_NGS, 2008-02-24,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945E_M,  CR620022601,  NONE, 0.5825, 0.6459, 30, 0
 x423 X423_1984_NGS, 2008-02-25,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945E_M,  CR620022601,  NONE, 0.5825, 0.6459, 30, 0
 x423 X423_1984_NGS, 2008-02-26,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945E_M,  CR620022601,  NONE, 0.5825, 0.6459, 30, 0
 x423 X423_1984_NGS, 2008-02-27,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945E_M,  CR620022601,  NONE, 0.5825, 0.6459, 30, 0
 x423 X423_1984_NGS, 2008-02-28,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945E_M,  CR620022601,  NONE, 0.5825, 0.6459, 30, 0
 x423 X423_1984_NGS, 2008-02-29,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945E_M,  CR620022601,  NONE, 0.5825, 0.6459, 30, 0
 x423 X423_1984_NGS, 2011-09-10,  JLS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH701945E_M,  CR620022602,  NONE, 0.6419, 0.7028, 15, 171345
 x423 X423_1984_NGS, 2011-09-11,  JLS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH701945E_M,  CR620022602,  NONE, 0.6419, 0.7028, 15, 0
 x423 X423_1984_NGS, 2011-09-12,  JLS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH701945E_M,  CR620022602,  NONE, 0.6419, 0.7028, 15, 0
 x423 X423_1984_NGS, 2011-09-13,  JLS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH701945E_M,  CR620022602,  NONE, 0.6419, 0.7028, 15, 0