benchmark, date, observer, organization, receiver, receiver_sn, receiver_type, antenna, antenna_sn, dome, height (m), slant height (m), interval, first_observation (s)
 gra5 GRAY_GPS_1995_NGS, 2003-09-14,  WCH ,  USGS ,  ASHTECH,  LP03175 ,  Z-XII3 CD00,  ASH700936E_C,  CR16376,  NONE, 1.345, 1.3929, 30, 154030
 gra5 GRAY_GPS_1995_NGS, 2003-09-15,  MRF ,  USGS ,  ASHTECH,  04597 ,  Z-XII3 CD00,  ASH701945B_M,  CR519993703,  NONE, 1.3127, 1.3609, 30, 154830
 gra5 GRA5_GPS_1995_NGS, 2007-09-13,  SBM ,  USGS ,  ASHTECH,  LP019992804 ,  Z-XII 1L00,  ASH701945B_M,  CR519993706,  NONE, 1.2733, 1.3219, 30, 171330
 gra5 GRAY_GPS_1995_NGS, 2007-09-27,  MBA ,  USGS ,  ASHTECH,  LP03360 ,  Z-XII3 1L00,  ASH701945E_M,  CR620022605,  NONE, 1.5436, 1.5899, 30, 15930
 gra5 GRAY_GPS_1995_NGS, 2011-09-20,  SW ,  USGS ,  ASHTECH,  ZE120023208 ,  Z-X ZE210,  ASH701945E_M,  CR620022601,  NONE, 0.8274, 0.8829, 15, 3415
 gra5 GRAY_GPS_1995_NGS, 2011-09-21,  SAH ,  USGS ,  ASHTECH,  ZE1200526043 ,  Z-X ZE210,  ASH701945B_M,  CR519993706,  NONE, 0.6315, 0.6928, 15, 145745