Left: cross-comparison of species from IRAS 16293 A in comparison to those from IRAS 16293 B. The statistical distance S is represented in the colour scale for each pair of species. One cell with a given value S of the plot should be read as “The abundance of the species X with respect to Y towards IRAS 16293 A is S sigma higheror lower compared to IRAS 16293 B”, with X and Y species taken from the X-axis and Y -axis, respectively. A positive value of S corresponds to N_X∕N_Y higher in IRAS 16293 A in comparison to IRAS 16293 B. Right: “CH₃OH” and “C₂ H₅OH” rows of the cross-comparison map. The two plots show the comparison of abundances with respect to CH₃ OH (upper panel) and C₂H₅OH (lower panel) towards IRAS 16293 A and IRAS 16293 B in terms of statistical distance.