These web page show the long-term tracking performance of the daily RINEX data of the EPOS-GNSS stations. The data quality metrics are retrieved from the EPOS-GNSS data nodes where they were computed using the G-Nut/Anubis software. Input files are the daily RINEX (V2 or V3) observation files available from each node. Hence, for the same EPOS-GNSS station and day, the quality metrics can differ from one node to the other.