Integrated velocity contours of MALT90 emissions (HCN, HNC, HCO⁺, C₂H, N₂H⁺, and HC₃N) superimposed on six color images of different parameter distributions (T_MB(¹³CO), ratio = T_MB(¹³CO)/T_MB(C¹⁸O), τ(¹⁸CO), T_ex(¹³CO), N(¹³CO)[ × 10¹⁶] and 8 μm). The contours are at multiples of the 12%, 13%, 12%, 16%, 14%, and 15% level of each of the HCN, HNC, HCO⁺, C₂H, N₂H⁺, and HC₃N emission peaks, which are 9.573, 7.953, 9.781, 4.791, 10.490, and 2.555 K km s^-1, respectively. The integrated velocity range is from s − 53.0 to s − 43.0 km s^-1 for all contours. The black symbols “▴”, “■” and “★” indicate the positions of the water maser, the methanol maser, and IRAS 16158-5055, respectively.