We propose to implement the Line-of-Sight concept (LoS) to eliminate the background from randomly distributed contacts, which is equivalent to classification of contacts into corresponding and noncorresponding to interatomic interactions. Thus, we start with understanding the physical meaning of this procedure. LoS concept considers the atoms as interacting only when they "see" each other (Figure ) because no other atom in the structure intrudes between them or, in other words, shields them from one other (for the exact definition see the SI). We identify three main types of contact shielding, namely, the covalent, intra-and intermolecular shielding depending on the type of shielding atom (Figure ), with the only the covalent shielding having the characteristic distances comparable to that of the Dmax. A representative example of the contributions of the LoS and shielded contacts for the complete dataset of N•••O contacts is illustrated in Figure .