Infrared data supporting our paper on KNbO3 under pressure

This data set contains the processed FTIR spectra as displays in our paper. The zip file contains two subfolders: \spectra\ contains .txt files with the FTIR reflectivity spectra in a simple xy format, truncated to the exploitable energy range but otherwise unfiltered. The number in the filename is the pressure. \fit_reports\ contains *.fit files with fitting reports produced by the python 3 lmfit package. The function used for the fitting is based on the factorized form of the dielectric function with 11 modes, most of which are meant to capture spurious interferences and other artifacts. The main mode or interest, the antipolar Nb mode, is numbered '05'. The functions are defined in the functions.py file.