Relations between the HCO⁺(2−1) and HCN(2−1) integrated intensities and the line widths (FWHM) of the lines. The LMC pointings appear as blue triangles and the SMC pointings as red triangles. The light and dark blue squares indicate the individual detections from the LMC spectral maps (18″ pixels) detected at a 3 and 5-σ level, respectively. Panel a: the dashed black line indicates the best linear fit to all the data. Panels a and c: the dotted gray line is the 1:1 relation.