As a second test of the impact of spin-contamination on geometry and spin-state energy differences, we explored the role of spin-projection in calculating spin crossover gaps in a broad set of transition metal compounds. The set of spin crossover species previously used by Hughes and Friesner in the development of their DBLOC model. ) 2 e g -e g (d ) 20 e g -t 2g (d 5 ) 6