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DORI maps for (a) [1.1.1]-propellane, (b) [2.1.1]-propellane (three-carbon ring plane), (c) [2.1.1]-propellane (four-carbon ring plane), (d) [2.2.1]-propellane (three-carbon ring plane), (e) [2.2.1]-propellane (four-carbon ring plane), (f) [2.2.2]-propellane. Values in the range from 0 (red) to 1 (blue).
