[Ifeffit] lfms1

Dear users, I have a question about the value lfms1 is the SCF card. What difference does it make if lfms1=0 (solid) versus lfms1=1 (molecule) for hydrated metal ion clusters? My understanding from the manual is that if the metal is the absorber and I am working with cluster, then lfms1=1. However, if the cluster is sufficiently large (radius=6 Ang--8 Ang), then should it be treated as a solid or molecule? Also, how crucial are the hydrogen atoms in the scattering process? Can the EXAFS spectra be computed with only the metal ion and oxygen positions or the hydrogen positions must be included as well? Thank you.