Left panel: TMC 1 total visual extinction (the visual extinction along the line of sight) map based on Herschel dust emission maps from Jason Kirk (private communication). Right panel: visual extinction map of Barnard 1 from the opacity at 850 μm derived by Zari et al. (2016). In both maps the observed positions are in lines of constant declination, or cuts, where the red squares mark those positions in which only IRAM 30 m telescope data is obtained, and green squares mark positions with additional Yebes 40 m data.