Visualization of $L_{\text{HCN}}^{\prime }/L_{{\text{HCO}}^{\text{+}}}^{\prime }$ in the position-position-velocity space. The whole sample except for UGC 11763, UGC 2982, and NGC 5734 are presented. Each spaxel has a size of 0.05″ × 0.05″ × 20 km s⁻¹. A 3σ threshold clipping for both HCN and HCO⁺ was applied. We only consider spaxels with the global aperture (see Sect. 4.1) and with the velocity range listed in Sect. 4.3. The colors represent $L_{\text{HCN}}^{\prime }/L_{{\text{HCO}}^{\text{+}}}^{\prime }$ in the range from 0.285 (blueish) to 3.5 (red-pinkish).