Molecular fractional abundances. As in Fig. 9, hydrocarbons are characterised by blue, cyan, and green colours and are grouped to the left on the x-axis for each source. Molecules with a cyanide group are indicated in red, orange, and pink and are grouped to the right. The molecules on the x-axis are ordered from left to right according to increasing number of atoms (or carbon atoms in the case of equal total atom counts). Upper limits are indicated by downward-pointing triangles.