Distribution of all the maser spots (filled circles) contributing to the maser features for B-array data. The background image shows B-configuration continuum emission (blue scale and contours). The spots are color coded by LSR velocity (color bar). The nth blue contour is at , where S_max is the maximum continuum flux shown in the blue bar for each panel, n = 0, 1, 2..., and p is equal to 10%. Positions of radio continuum sources identified in previous observations are marked with black stars alongwith their names. Maser spots detected with the EVN by Rygl et al. (2012) are shown as filled squares. The gray grid shows the Galactic coordinate system. The beam size of the radio continuum maps is 1.″5 × 1.″5. The maser position errors are ≈0.″2 (see Sect. 3).