The graph shows the Meteosat-11 longitude and the mean radius vector.
Before February, the satellite longitude was in the range 3.2 to 3.6 degrees west.
Since that location is not stable, Meteosat-11 needed to be reboosted every 87 days for the normal station-keeping.
When EUMETSAT needed to replace the Meteosat-10, they deboosted the Meteosat-11 (\(\Delta R = 35.3\ km\) and \(\Delta V = 1.3\ m/s\)) to increase the orbital speed and hence to start moving it eastward.
When the satellite reached the new intended longitude, they reboosted the satellite (\(\Delta R = 40.3\ km\) and \(\Delta V = 1.5\ m/s\)) to decrease the orbital speed and hence stopping the eastward motion.
EUMETSAT is now doing the normal station-keeping manoeuvres to keep the longitude in the range -0.2° to 0.8°, which is a similar range used for the Meteosat-10, as explained
here.
This graph shows the longitude evolution during the replacement.
The green segments represent the deboost and the reboost phases. The dots represent the TLEs.
It is clearly shown the eastward longitude shift during the "low altitude" phase.