The matlab script plot_XRDdata3a.m (also available .txt) contains comments that explains the data contained in text files:

XRD_Si_pdf.txt - The powder diffraction lines of Si
XRD_MgB2_pdf.txt - The powder diffraction lines of MgB2
MgB2_Expt_XRDdata.txt - The experimental X-ray diffraction data of our 160nm MgB2 film.