Simulations of propynal emission in the 9_0, 9 − 8_0, 8 and 11_0, 11 − 10_0, 10 transitions overlaid on the ASAI observations of Barnard 1. The bold, blue trace represents the expected emission profile given the column density and linewidth reported in Loison et al. (2016), although using our partition function. The thinner red trace is the upper limit presented from our work, simulated using the linewidth from Loison et al. (2016).