benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 hor2 HORK_2_USGS, 2017-08-16,  JLS ,  USGS ,  JAVAD TRE_G3TH,  01661,  SIGMA3.5.14,  ASH701945B_M,  CR619992805,  NONE, 0.773, 0.8298, 15, 0
 hor2 HORK_2_USGS, 2011-11-04,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14330,  NONE, 0.8499, 0.9049, 15, 172645
 hor2 HORK_2_USGS, 2011-11-05,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14330,  NONE, 0.8499, 0.9049, 15, 0
 hor2 HORK_2_USGS, 2011-11-06,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14330,  NONE, 0.8499, 0.9049, 15, 0
 hor2 HORK_2_USGS, 2011-11-07,  JMS ,  USGS ,  ASHTECH,  ZE1200331006 ,  Z-X ZE210,  ASH700936D_M,  CR14330,  NONE, 0.8499, 0.9049, 15, 0
 hor2 HORK_2_USGS, 2012-10-17,  JMS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE210,  ASH700936D_M,  CR14341,  NONE, 0.8673, 0.9219, 15, 0
 hor2 HORK_2_USGS, 2012-10-18,  JMS ,  USGS ,  ASHTECH,  ZE1200331018 ,  Z-X ZE210,  ASH700936D_M,  CR14341,  NONE, 0.8673, 0.9219, 15, 0
 hor2 HORK_2_USGS, 2013-05-21,  JMS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE210,  ASH700936D_M,  CR14329,  NONE, 0.811, 0.8669, 15, 171515
 hor2 HORK_2_USGS, 2013-05-23,  JMS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE210,  ASH700936D_M,  CR14329,  NONE, 0.812, 0.8679, 15, 175815
 hor2 HORK_2_USGS, 2013-05-24,  JMS ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE210,  ASH700936D_M,  CR14329,  NONE, 0.812, 0.8679, 15, 0
 hor2 HORK_2_USGS, 2017-08-15,  JLS ,  USGS ,  JAVAD,  01661 ,  TRE_G3TH SIGMA3.5.1,  ASH701945B_M,  CR619992805,  NONE, 0.773, 0.8298, 15, 185915
 hor2 HORK_2_USGS, 2017-09-12,  ELP ,  USGS ,  JAVAD,  00618 ,  TRE_G3TH SIGMA3.6.9,  ASH701945E_M,  CR620022605,  NONE, 0.7956, 0.8518, 15, 1680
 hor2 HORK_2_USGS, 2017-09-13,  ELP ,  USGS ,  JAVAD,  00618 ,  TRE_G3TH SIGMA3.6.9,  ASH701945E_M,  CR620022605,  NONE, 0.7956, 0.8518, 15, 0
 hor2 HORK_2_USGS, 2017-09-14,  ELP ,  USGS ,  JAVAD,  00618 ,  TRE_G3TH SIGMA3.6.9,  ASH701945E_M,  CR620022605,  NONE, 0.7956, 0.8518, 15, 0