This is from dielectric spectroscopy data for a metal-oxide ceramic that has two major phases and a small amount of a third phase present. It's a plot of AC conductivity vs angular frequency for this sample at a particular temperature.
I have tried both the single and double power law's. I've tried adding a third and fourth term. How do I interpret this result? What should I use to fit this curve properly?
EDIT: I am attaching images of the curve in question. In one image, the plot was changed to a log-log plot.