Cumulative extinction as a function of the distance in the remnant’s direction. Left panel: One-dimensional cumulative extinction graph as a function of the distance up to ∼3 kpc (Lallement et al. 2019 data sets) toward S147, obtained using the GAIA/2MASS tool for one-dimensional extinction computation⁴. Right panel: One-dimensional cumulative extinction graph as a function of the distance up to ∼5 kpc (updated Lallement et al. 2022 data sets) towards S147, obtained by using the EXPLORE G-Tomo tool for one-dimensional extinction computation⁵. In both panels, the black area corresponds to the distance uncertainty estimation when employing Eq. (2), and the obtained best-fit value of the absorption column density derived from the spectral analysis. The red point represents the obtained extinction when assuming that the remnant is located at a distance of 1.3 kpc.