XPS: look at code from ALS

[farhi]

Code for XPS I/O and plot:

• https://github.com/Yohko/MATLABTools

[farhi]

And code for RIXS from

• https://web.njit.edu/~kenahn/programs/K-RIXS
• RIXS-LaSrMnO-v2.zip