Water maser spectra observed towards MG J0414+0534 between July 2007 and January 2010. The first spectrum (bottom left corner) is the combined Effelsberg and EVLA spectrum (channel spacing 38.4 km s^-1) obtained by observing 14+12 h on-source between July and October 2007 (for details, see Impellizzeri et al. 2008). The other spectra have been taken with Arecibo. The spectra shown here have been smoothed to a resolution of 19.2 km s^-1. The blue and red vertical lines indicate the peak velocities of the main and satellite maser features, respectively, as measured in the October 2008 spectrum.