## 2 Methodology
\begin{table}
\begin{tabular}{l c c c c} \hline \hline \multicolumn{1}{c}{**Station**} & \multicolumn{1}{c}{**Antenna Type**} & \multicolumn{1}{c}{**Serial**} & \multicolumn{1}{c}{**Calibration**} & \multicolumn{1}{c}{**Manufacturer**} \\ \cline{1-1}  & & **Number** & **Time** & \\ \hline NYA200 NOR & JAV\_RINGANT\_G3T NONE & 342 & 11.11.2010 & \\ OBE400 DEU & JAV\_RINGANT\_G3T NONE & 340 & 14.07.2010 & \\ \hline BRUX00 BEL & JAVRINGANT\_DM NONE & 464 & 01.02.2011 & \\ \hline BADH00 DEU & LEIAR10 NONE & 12356022 & 08.03.2012 & \\ \hline GELL00 DEU & LEIAR25.R3 LETT & 10170027 & 25.04.2018 & \\ GOR200 DEU & LEIAR25.R3 LEIT & 08500024 & 18.01.2019 & \\ WRLG00 DEU & LEIAR25.R3 LEIT & 10240009 & 03.12.2010 & \\ \hline DOUR00 BEL & LEIAR25.R3 NONE & 09300021 & 23.08.2010 & \\ \hline AUBG00 DEU & LEIAR25.R4 LEIT & 725552 & 23.08.2018 & \\ BAUT00 DEU & LEIAR25.R4 LEIT & 725267 & 25.04.2018 & \\ BORJ00 DEU & LEIAR25.R4 LEIT & 726363 & 13.10.2017 & \\ DIEP00 DEU & LEIAR25.R4 LEIT & 725557 & 23.08.2018 & \\ DILL00 DEU & LEIAR25.R4 LEIT & 725266 & 23.08.2018 & \\ EUSK00 DEU & LEIAR25.R4 LEIT & 725299 & 02.03.2012 & \\ HEL200 DEU & LEIAR25.R4 LEIT & 726209 & 25.04.2018 & Switzerland \\ HELG00 DEU & LEIAR25.R4 LEIT & 726342 & 24.04.2018 & \\ HOF00 DEU & LEIAR25.R4 LEIT & 10211013 & 18.01.2019 & \\ HOFN00 ISL & LEIAR25.R4 LEIT & 725283 & 07.03.2012 & \\ ISTA00 TUR & LEIAR25.R4 LEIT & 726339 & 13.10.2015 & \\ NIC000 CYP & LEIAR25.R4 LEIT & 725285 & 07.03.2012 & \\ PTBB00 DEU & LEIAR25.R4 LEIT & 726333 & 13.10.2015 & \\ RANT00 DEU & LEIAR25.R4 LEIT & 726365 & 18.01.2019 & \\ REYK00 ISL & LEIAR25.R4 LEIT & 725281 & 01.03.2012 & \\ SAS200 DEU & LEIAR25.R4 LEIT & 10231013 & 19.03.2019 & \\ WARN00 DEU & LEIAR25.R4 LEIT & 725559 & 15.10.2018 & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: List of the EUREF Permanent GNSS Network (EPN) stations equipped with antennas calibrated by the University of Bonn. The calibration tables for the listed stations contain at least G01, G02, E01 and E05 corrections. \begin{table}
\begin{tabular}{c c} \hline \hline
**Approach** & **DD** & **PPP** \\ \hline Software & GAMIT/GLOBK 10.71 & GAMP \\ System & GPS and Galileo separately \\ Frequencies & L1/L2 for GPS and E1/E5a for Galileo \\ Observations & Ionosphere-free code and phase combination \\ Elevation mask & 7 deg. \\ Orbits & CODE MGEX \\ Transmitter PCC & igs14.atx \\ Receiver PCC & Depending on the solution: E1, E2, E3, G1, and G2 \\ Troposphere delay & VMF1 \\ Clock errors & 1 h ZTD and 24 h grad & ZTD and grad every epoch \\ Ambiguities & Fixed & Float \\ EOP & IERS2019 \\ Tide displacement & IERS2010, FES2004 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Processing parameters adopted for both approaches. The processing strategy for E1, E2 and E3 was consistent at all points except one. As the receiver antenna phase center corrections for the selected 25 antennas, we used different values from the sources. In the first solution (E1), we used original Galileo-based values from the chamber calibrations. For the second solution (E2), we used GPS-based values from the same chamber calibrations. All of the remaining stations for these two solutions were processed in the same way using the original calibrations as are. Depending on the availability, the PCCs came from individual robot calibrations (performed by Geo++ GmbH mostly) or the IGS-type mean models (also based on Geo++ GmbH calibrations). In the third solution (E3), we completely skipped individual calibrations and used the IGS-type mean models [31]. Antennas at all stations, including the selected 25, were modeled with GPS-based correction values. For GPS, we produce only two solutions. The first (G1) was prepared according to EPN guidelines, and individual calibrations (both chamber and robot) were taken into account as a priority. For the second one (G2), we used only the IGS-type mean models. All five solutions were adjusted to the IGS14 framework by the list of 22 fiducial stations.