Author: Jakub Kostelecky Due to receiver stoped operation the data from 2015:317-hour H to hour P are missing. We appologize for all inconveninces caused. Best Regards, Jakub Kostelecky GOP operation center Geodetic Observatory Pecny Research Institute of Geodesy, Topography and Cartography Czech Republic www.pecny.cz,www.vugtk.cz