Contour maps for the integrated intensity of CN 1-0 (green), HCN (red) and HNC 1-0 (blue) for four representative clumps superimposed on their respective continuum map in gray scale at 8.4 (or 4.8) GHz (left) and 1.4 GHz continuum map (right). The contour levels are 30%, 50%, 70%, and 90% of the map peak, the heavy lines represent 50%. Here CN(1-0), HCN(1-0), and HNC(1-0) emission of G22.35+0.41 is very weak, the corresponding contour levels are 2σ, 3σ (heavy line), 4σ, and 5σ. The red asterisk in the map indicates the position of HMSC, HMPO, UCHII, and HII regions. The red circle in the bottom left corner represents the FWHM beam size for the molecular lines, the enclosed black circle indicates continuum emission observations. The horizontal lines in the bottom right corner of the left panels indicate the linear scale corresponding to one arcminute at the distance of the respective clump. The unit of the gray scale bar on the right is in Jy/beam.