[CH]/[CH₂] ratios in semi-regular truncated polyhedra, stT (red), stO (blue), and stC (green), as a function of the truncation length (a = 0 [thick], (dotted), [dashed]), and the number of constituent carbon atoms N_C. The thick lines show the data for the un-truncated polyhedra and the thin dashed lines show the a = l∕2 limiting cases, except for stT where a = 0.49 l. The dangling and rising thinner lines show the effects of increasing truncation. For the C polyhedra, and for illustrative purposes only, an arbitrarily low value (10⁴ l) of the [CH]/[CH₂] ratio was assumed.