In PAP

1. [1]p35e7 need to check refs for full explanation of where this comes from {PAP_41}

     javg += (el_i.c1 * el_i.z / el_i.mass * np.log(el_i.z*(10.04 + 8.25*np.exp(-1.0*el_i.z/11.22))/1000.))
   

2. Total Trajectory [g/cm^2] [1]p35e9

     dr0 += 1/mavg*(j_mip**p2*d_k[k])*(el_p.e0**p1 - el_p.xray**p1)/p1
   

   updated? with E0^p1-Eq^p1 from just Eo^p1 need to find ref {PAP_62}

3. Ionization crosssection [1]p36e10-11 mparam from Hutchins (get Ref) {PAP_67}
4. [1]p54e39 PAP Weighting laws. with extra factors (/5, /2, /3) where do they come from? {PAP_89} See Scanning 1990 PAP p 218 as well… N is integral..??