Comment on:"Dynamics of glass-forming liquids. XIII.Microwave heating in slow motion"[J. Chem. Phys. 130,194509,(2009)]

We show that the time dependent Dielectric Hole Burning experiments performed on supercooled liquids in the commented paper should be analyzed with a much shorter time step. The results would then exhibit strong short times oscillations, completely ignored in that paper. Also, different data corresponding to the same liquid are inconsistent ones with the others. They impede comparison between theory and experiment.