Molecular line integrated intensity maps overlaid with the 870 μm continuum contours in G28.34 S, IRDC 18530, IRDC 18306, and IRDC 18308. The maps in each source are ordered in different groups according to line rest frequencies and the leading isotopes. Colormaps show the intensity integrations (K km s^-1) over the velocity dispersion of each line. For the lines with <4σ detections, we only integrate a total of three channels around the system V_lsr at their rest frequencies. The purple contour in each panel indicates the area with integrated intensity >4σ rms. The black contour indicates the area within which integrated intensity is over the half maximum in the field of view. The white contours show the continuum emission from 870 μm ATLASGAL data, starting from 10σ and increasing by 10σ.