Fig. 3
From: Graph isomorphism-based algorithm for cross-checking chemical and crystallographic descriptions
Representation of a tetrahedral chiral centre (partial graph shown). Small empty circles are named enumeration-listing nodes, representing three possible alternative enumerations of the remaining three attached atoms in clockwise order. Dashed edges connect enumeration-listing nodes to the central atom and the atom from which the central atom is viewed. Dashed and dotted edges connect enumerator-listing nodes with enumerated atoms, with number of dots on edge identifying the order (H atom is first, Cl is second and F is third). The remaining six dashed and dotted edges are not shown for clarity of the figure. In addition, the other nine enumerator-listing nodes and related edges are not shown