Corner plot for the MCMC fit ofHC7N parameter covariances and distributions in the Cha-MMS1. The diagonal shows the probability distributions of each parameter as histograms, with vertical lines marking the 16th, 50th, and 84th percentiles, corresponding to ±1σ for a Gaussian posterior. The off-diagonal scatter plots depict the correlations between pairs of parameters, with each axis representing one of the fit parameters. The beam-averaged best-fit column density is consistent with the Weeds pencil beam value listed in Table 4.