Relation of millimeter emission with SFR and H₂. Left: Correlations between the surface densities of the SFR (Σ_SFR) and the observed millimeter luminosity (ΣL_mm) at 1.15 mm (circles) and 2 mm (triangles) in NGC 2146 (green) and NGC 2976 (red). The lines show the OLS-bisector fits (see Table 8). Right: Same as the left, but for the surface density of molecular gas (Σ_H2) as the Y-axis. The maps are smoothed to one pixel per 18″ beam width to prevent internal correlation between pixels. The error bars indicate 1σ_rms noise of each map, and when not shown, it means that they are smaller than the symbol size.