Comparison of PM7 and PM6 Heats of Formation of Solids with Reference Values

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All values in Kcal/mole.  671 entries. Some values for PM6 were outside the graph boundaries; these have been reset to the boundary.  The sharp cutoff in the distribution of heats of formation in PM6 at 0 kcal/mol is due to the small number of solids with positive heats of formation - most elements are solids, and by definition have a heat of formation of zero.