HCN(1–0)/HCO⁺(1–0) brightness temperature ratio map (R_dense) derived at the common spatial resolution of ≃56 pc. The brown circle of 8″ in radius (≃560 pc) locates the inner region of the galaxy disk where the molecular outflow signature has been identified in the kinematics of molecular gas (García-Burillo et al. 2014, 2019). This region, purposely excluded from our analysis of SF relations, shows significantly higher line ratios (R_dense ≃ 1.5 − 3.5) compared to the SB ring (R_dense ≃ 0.5 − 1.5). Other symbols are the same as in Fig. 1.