Positions of maser features (filled circles) overlaid on continuum emission (blue scale and blue contours) for B-array data. The masers are color coded by LSR velocity (color bar). When only one velocity component is detected, the velocity is given at the bottom of the panel. Names and positions of radio continuum sources identified in previous observations are also marked (black stars). 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%. The magenta rectangle in panel 1 depicts the approximate extent of a 1.3 mm continuum source detected with NOEMA (Gieser et al. 2019). 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).