L_IR as a function of (left) global $L_{\text{HCN}}^{\prime }$ and (right) global $L_{{\text{HCO}}^{\text{+}}}^{\prime }$. In both panels, the numbers indicate the galaxy ID as defined in Table 1. Small yellow dots, crosses, and open circles indicate the presence of CONs, outflows, and inflows, respectively. The solid lines are the fitting results: log L_IR = 0.53log $L_{\text{HCN}}^{\prime }$ + 7.5 and log L_IR = 0.61log $L_{{\text{HCO}}^{\text{+}}}^{\prime }$ + 6.9. As reference, the dashed lines are the best-fit relations taken from Juneau et al. (2009).