2D-binned histogram maps of different shock parameters using a dynamic spectrum-like representation (more details for the construction of the maps are given in the text). Panel (a) shows the synthetic spectra for M_A, panel (b) for the density compression ratio, panel (c) for θ_BN, and panel (d) for the regions where the criterion for the excitation of Langmuir waves is fulfilled. The intensity of the synthetic spectra depicts the median values of the shock parameter considered for each panel. The high-intensity features labeled in panel (a) as low-frequency modeled lane (LFML), high-frequency modeled lane (HFML), and high-frequency modeled region (HFMR) are regions of high median shock strength (see text for details).