How to avoid of of of in the Appendix title
"occurrence probability models" will confuse anybody not in a technical area that uses this term (you can find it by Googling, but it's not the usual terminology in any area I know).
I would suggest
models for probability of occurence;
"models for" and "models of" are more or less interchangeable in many fields of science, and "models for" avoids the repetition of "of".