Line contamination of the 1.3 mm continuum fluxes of getsf sources, as estimated from the ratio of denoised & bsens to cleanest peak fluxes, and shown as a function of the S/N in the cleanest image. The gray curve indicates the median value of the core ratios, computed over bins of 20 adjacent cores as ranked by their S/N. The shaded gray area indicates the corresponding 3 σ dispersion in flux ratio values. The red, orange, and green points locate cores with hot-core signatures (Herpin et al., in prep.), cores contaminated by the CO(2–1) line, and cores contaminated by other spectral lines, respectively. The horizontal lines indicate the contamination levels of 0% (magenta dashed line) and 20% (green dotted line). By taking only the blue points, the denoised & bsens over cleanest ratios of Fig. 4 have a median value of ≃ 1.1 ± 0.3.