Color maps of the velocity-integrated intensity of the J = 1 → 0 transition of ¹²CO, ¹³CO, N₂ H⁺, HCN, H¹³CN, HCO⁺, H¹³CO⁺, HNC and HN¹³C, toward M8 E. The square outlined by the dashed red lines in the map of ¹²CO denotes the area of the smaller maps of HCN, H¹³CN, HCO⁺, H¹³CO⁺, HNC, and HN¹³C. Position offsets are relative to the position of M8E-IR (marked with an asterisk) and given in Sect. 2. The contour levels are from 10 to 100% of the corresponding peak emission (given in Table 1) for ¹²CO, ¹³CO, N₂ H⁺, HCN, H¹³CN, HCO⁺ and HNC. For H¹³CO⁺, and HN¹³C maps, the contour levels are from 3rms to peak emission in steps of 2rms. All maps are plotted using the original FWHM beam sizes shown in the lower left of each map and listed in Table 1.