Top panel: gray-scale image: JVLA A-Array C-band continuum, using gray-tone steps that increase linearly with the map intensity from 0.010 to 0.096 mJy beam^-1. The JVLA A-Array Ku-band continuum is represented with cyan contours with plotted levels −10% and from 10% to 90%, in steps of 10%, of the peak value of 0.26 mJy beam^-1. The white contours reproduce the JVLA A-Array K-band continuum, plotting levels −10% and from 10% to 90%, in steps of 10%, of the peak value of 0.5 mJy beam^-1. Colored dots and arrows have the same meaning as in Fig. 1. Bottom panels: zoom on the area of the main, compact Ku- and K-band continuum sources (left) and on the water maser emission (right). In both panels, the gray-scale image, the cyan and white contours have the same meaning as in the top panel. Colored dots and arrows have the same meaning as in Fig. 1: for this clustered maser source, to better distinguish maser positions on top of the dark background, the colored dots are white-bordered. The amplitude scale for the maser velocity is indicated by the white arrow in the bottom left of the panels.