4. Choice of Phi(0) expressions:

(Not applicable if one of the ZAF corrections (#1-6) or PAP was selected for the absorption correction)

1 … Phi(pz) Equation of Reuter

2 … Phi(pz) Equation of Love-Scott

3 … Phi(pz) Equation of Riveros

4 … Phi(pz) Equation of Pouchou and Pichoir

5 … Phi(pz) Equation of Karduck and Rehbach

6 … Phi(pz) Equation of August and Wernisch

7 … Phi(pz) Equation of Packwood

Both #1 and #2 give similar results. The default selection is #2.