Time variation of the brightest maser feature in CM2-W2. Top panels: Offsets and V_LSR of maser spots in the brightest feature of CM2-W2 for each epoch. The position, uncertainty and V_LSR of each spot is shown. We note the difference in spatial scale between right ascension and declination. Bottom panels: Spectral profile of the maser spots in this feature, with Gaussian fits shown in black. In 2014.9 and 2015.1 the feature is well approximated by a double Gaussian.