Figure . Solute-correlated spectra presented alongside the bulk spectra for a. 20%, b. 40%, c. 60%, d. 80%, e. 100% samples in the i. NP10, ii. NP30 and iii. NP50 series. The overlay of all the solute-correlated spectra for the respective series have been presented in i.f., ii.f. and iii.f. alongside the average bulk spectra for the series.