"Data" folder contains the data used for generating the figures in the manuscript of the same title to be published in Optics Letters Vol. 40 No. 23. 
The folder "Code" contains the code used to generate the figures. "LIADPaperFig3.m" contains furthermore the fitting routine (the fitted function is described in the file "DopplerCsVoigt2VarGammaSelfBroad.m") used to obtain the data in "Data" out of the raw experimental data. "LIADFig7c.m" contains the code for the model outlined in the paper.