Extrapolation method applied on the highest S/N clump at J2000 coordinates 00^h 42^m 43.9^s and +41 °  15′ 35.84″ with SNR^peak = 10.3 and SNR^tot = 64.4. We perform extrapolations to the 0-level with a linear regression (red dashed line) on the data for spatial size σ_maj and σ_min (top panels), velocity dispersion σ_v distribution (bottom left panel), and total flux F_CO (bottom right panel). The uncertainty is computed with the bootstrapping method. The blue dashed lines indicate where Φ_iso/Φ_max is equal to 1 and 3σ_noise. Since we expect our clumps to be barely resolved, we show as a magenta dashed line the size for a perfect Gaussian PSF, noiseless, and simulated equivalent case. The red dots indicate the values found by fitting a Gaussian for the velocity distribution and total flux. The size over the major and minor axis is slightly larger than that obtained for the simulated clump, which suggests that this clump is barely resolved. The velocity dispersion is about 4 times the spectral resolution (2.2 km s⁻¹). There is a good agreement between the extrapolated velocity dispersions and those directly measured on the spectra, while the total flux is slightly higher for the extrapolation.