Fig. 2.

Distribution of basin sizes (dots) and frequency histogram of basins (bars) over the energy range within the energy landscape of RNA d33. Relative energies are given by $E_{\text{rel}}(x)=(E(x)-E_{\min })/(E_{\max }-E_{\min })$ where $E_{\min }/E_{\max }$ denote the energy boundaries over X. The dotted line marks the position of the unstructured state with energy 0