Statistical distance between molecular ratios in SMM1 and IRAS 16293B, given in σ. Larger σ values indicate a larger difference between the two sources for a given ratio. Positive values indicate that a ratio is higher in SMM1-a, while negative values indicate that a ratio is lower in SMM1-a. In particular, all ratios of HOCH₂CN are found tobe higher in SMM1-a than in IRAS 16239B.