MERLIN observations of the maser feature at the velocity of the flare from W Hya seen in Pushchino data at 20011023 (Fig. 43). The upper three plots show the velocity profiles at the epochs bracketing the flare. The brighter, more blue-shifted feature is shown by circles, and an adjacent feature by squares. Symbol size is proportional to the square root of flux density. The lower three plots show the corresponding maser positions, showing that the weaker feature has moved from N to S and brighter feature has moved across it in the opposite direction from S to NW.