¹³CO 3–2 integrated intensity (in K km s^-1 units) of the Orion Bar observed with the JCMT. The circles at the position of the CO⁺ peak (α_J2000 = 05^h35^m20.6^s, δ_J2000 = −05°25′14′′) indicate the beam sizes corresponding to the smallest (band 7b, ~11′′) and largest (band 1a, ~44′′) beam sizes of the data presented in this line survey. The white symbols show the position of the Trapezium stars. The white contours show the distribution of the integrated intensity (in K km s^-1 units) of HCN 4−3 measured with the JCMT (van der Wiel et al. 2009). The contours are 25%, 40%, 60%, and 80% of the peak HCN intensity of ~24 K km s^-1.