Overlay of molecular masers detected around W51e2 onto the total intensity (0th moment) map of the (6, 6) inversion transition of NH₃ (gray scale and white+black contours). The circles show positions of CH₃OH masers detected with MeRLIN (Etoka et al. 2012, top panel), H₂O masers detected with the VLBA (Sato et al. 2010, middle panel), and OH masers detected with the VLBA (Fish & Reid 2007, bottom panel), respectively. Colors denote l.o.s. velocity in km s^-1 (color scale on the right-hand side in each panel). The NH₃ emission is shown with white contours, representing 20% to 100% with steps of 20% of the line peak for the (6, 6) line, 107 mJy beam^-1 km s^-1. The NH₃ absorption is shown with black contours, representing factors 1, 5, 9,.... of −50 mJy beam^-1. The cyan contour locates the peak of the total intensity map of the most highly excited NH₃ transitions (13, 13); the bulk of CH₃OH maser emission concentrates around the same peak. We assume that its position pinpoints the high-mass YSO W51e2-E.