Polypropylene glycol-400, PPG, 99% BASF N. B. Olsen, T. Christensen, and J. C. Dyre, Phys. Rev. Lett. 86, 1271 (2001). The data set is organized as 5 files: PPG.png - the plot of data PPG_Freq.dat - the frequencies PPG_Imag.dat - the imaginary parts PPG_Real.dat - the real parts PPG_Temp.dat - the temperatures