Comparison of the fractional abundances of different species with respect to H₂ determined on a pixel-by-pixel basis. The y-axis has been divided by the scaling values, which are given in parentheses after the molecule names along the x-axis for better visualization. The dotted lines indicate the 25%, 50%, and 75% percentiles of the respective distributions. The molecular abundances in TMC1 and L1544 are also indicated for comparison. The arrows indicate that their abundances are higher than the maximum value on the y-axis.