benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 morr, 2003-09-18,  JMS ,  USGS ,  ASHTECH,  04600 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022605,  NONE, 1.2339, 1.2829, 30, 10
 morr, 2003-09-19,  JMS ,  USGS ,  ASHTECH,  04600 ,  Z-XII3 CD00,  ASH701945E_M,  CR620022605,  NONE, 1.2339, 1.2829, 30, 10
 morr MORR_USGS, 2007-09-12,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945E_M,  CR520031626,  NONE, 0.4588, 0.5288, 30, 172530
 morr MORR_USGS, 2007-09-13,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945E_M,  CR520031626,  NONE, 0.4588, 0.5288, 30, 0
 morr MORR_USGS, 2007-09-14,  JMS ,  USGS ,  ASHTECH,  ZE120023202 ,  Z-X ZE21,  ASH701945E_M,  CR520031626,  NONE, 0.4588, 0.5288, 30, 0
 morr MORR_USGS, 2015-09-10,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.3.1,  ASH700936D_M,  CR14329,  NONE, 0.6585, 0.7188, 15, 173345
 morr MORR_USGS, 2015-09-11,  JLS ,  USGS ,  JAVAD,  00624 ,  TRE_G3TH SIGMA3.3.1,  ASH700936D_M,  CR14329,  NONE, 0.6585, 0.7188, 15, 0