Maser positions overlaid on dust and/or molecular emissions. The position of the maser is indicated with a cross. Top left panel: the NGC 6334 complex, color image and contours indicate 870 μm dust emission from the ATLASGAL survey (Schuller et al. 2009), with contour levels of 1, 5, 10, 20, 30 Jy beam^-1. Top right panel: G015.03−00.67 overlaid on 870 μm dust emission with contour levels of 1, 3, 7,11, 15, 19 Jy beam^-1. Top right panel: G011.49−01.48, color image and contours indicate 870 μm dust emission, with contour levels of 1, 2, 3, 4 Jy beam^-1. Middle left panel: G014.33−00.64, color image and contours indicate 870 μm dust emission, with contour levels of 0.5, 1, 2, 4, 8 Jy beam^-1. Middle right panel: G014.63−00.57, color image and contours indicate 870 μm dust emission, with contour levels of 0.5, 1, 2, 4 Jy beam^-1. Bottom left panel: G015.03−00.67 overlaid on 870 μm dust emission with contour levels of 1, 3, 7,11, 15, 19 Jy beam^-1. Bottom left panel: G011.49−01.48, color image and contours indicate 870 μm dust emission, with contour levels of 1, 2, 3, 4 Jy beam^-1. Bottom right panel:G034.39+00.22, false color indicates the intensity of the ¹³CO (J = 1 − 0) line integrated over 50–60 km s^-1, contours are the 870 μm dust emission, with contour levels of 0.5, 1, 3, 5, 7, 10, 20, 30 Jy beam^-1. Figure A.2 continued on next page.