This card runs FEFF with the multiple-pole self energy.

The values of the argument `ipl` correspond to the following:
0: run regular feff but print out the self energy;
1: run multiple pole self energy without renormalization;
2: run multiple pole self energy with renormalization.

It takes as input ``exc.dat`' which can be formed in the following
way:

- Calculate or measure the energy loss spectrum
- Use the formula detailed in `
`EpsInvFormula.ps`' to calculate and f. Now write three columns in ``exc.dat`', , , and f. is irrelevant at this time. Units should be eV.

The output file ``sigma.dat`' contains the self energy and the renormalization
constant (at the interstitial radius) as a function of photoelectron energy
in eV.

* make regular FEFF calculations, print out multiple-pole self-energy PLASMON 0