| bkg_corr | Background correction function |
| fit_athena | Porting of 'ATHENA' linear combination fitting |
| fit_float | Central fitting function with float environment |
| initial_load | Initial loading of spectra |
| LCF_solve_QP | Linear combination fitting solve function |
| LC_fit | Linear combination fitting function |
| plot_LCF | Plot sample data, linear combination fit and residual spectrum |
| read_raw_spec | Read raw spectra |
| specdat | Phosphorus K-edge XANES spectral data for LCF |
| std_df | Create a data frame of all standards |