A representative inter-RNA T-shaped interaction in the crystal structure of 70S ribosome of Thermus thermophilus. The distance between the interacting atom (heavy atom for the C-H group) of the vertical base and the center of the interacting ring of the horizontal base is provided. Although one atom belonging to the interacting edge may visually appear closer than the other atom of the same edge, the interacting atom is identified using a quantitative method according to the algorithm described in the Materials and Methods section. Note that including the information on the ring identity of the horizontal base and the interacting atom/group of the vertical base is optional and can be removed in ambiguous cases.
