Left panels: H₂ column density map of the TMC-1 molecular cloud (lower panel) and the B213 filament (upper panel) in Taurus,computed from Herschel and Planck data (Palmeirim et al. 2013; Rodríguez-Baras et al. 2021). The offsets observed towards the starless cores in our dataset are marked with a triangle. Right panel: H₂ column density of B213-C1 (upper panel). The triangles mark the positions observed with the GEMS large project, and the red circles show the beam size of the IRAM 30 m telescope at 97 GHz (~26″). The spectra of the 2_1,2–1_1,1 (E₂) transition of methanol (in red) overlaid with the J = 1–0 transition of C¹⁸O (in black) inall offsets towards B213-C1 are shown in the lower panel.