benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 h146, 2003-09-18,  WRT ,  USGS ,  ASHTECH,  04582 ,  Z-XII3 CD00,  ASH701945B_M,  CR619992801,  NONE, 1.4671, 1.514, 30, 1640
 h146, 2003-09-19,  CHS ,  USGS ,  ASHTECH,  LP00108.707 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022602,  NONE, 1.3349, 1.3829, 30, 14550
 h146 H146_1959_USC&GS, 2007-09-16,  JMS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE21,  ASH700936D_M,  CR14341,  NONE, 1.455, 1.5019, 30, 15590
 h146 H146_1959_USC&GS, 2007-09-27,  WRT ,  USGS ,  ASHTECH,  ZE1200331017 ,  Z-X ZE21,  ASH701945B_M,  CR619992805,  NONE, 1.3501, 1.3979, 30, 163430
 h146 H146_1959_USC&GS, 2015-09-15,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.3.1,  ASH700936D_M,  CR14341,  NONE, 0.7381, 0.7959, 15, 163045
 h146 H146_1959_USC&GS, 2015-09-16,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.3.1,  ASH700936D_M,  CR14341,  NONE, 0.7381, 0.7959, 15, 0