Something I have been looking for finally showed up under my nose, in the "Green Book" (1991 Electron Probe Quantitation, ed Heinrich and Newbury).
The question I had was, Which MACs were the ones that Pouchou and Pichoir used when they developed the PAP matrix corrections? As some people know and some may not, you cannot just swap MACs between any matrix corrections, as usually one specific matrix correction may have been tweaked using one specific set of MACs.
I learned on page 40 "The absorption coefficients associated with the PAP procedure are those of the model of MAC 30 of Heinrich except for very light emitters (Z<10); for these the coefficients are read from a table...." They show then in Appendix 5 a supplementary table of additional macs.