Molecular abundances with respect to CO scaled by 10⁴ for blueshifted (top) and redshifted (bottom) part of outflow for all sources. Gray triangles represent upper limits. Points on the plot show values calculated for the mean T_ex of the range defined for each molecule, see Table 3. Error bars represent the column densities calculated for minimum and maximum values of the excitation temperature. To obtain the abundanceof the given molecule, the column density was divided by the CO column density (for T_ex = 75 K.) measured in the region in which the emission from the molecule was above 3σ. The HCN emission is likely optically thick and therefore the abundance should be treated as a lower limit.