I'd like multiple smooth histograms on a single set of axes with legends. Legends do not seem to be among the options for SmoothHistogram. So I thought I'd calculate smooth histograms and use Plot. The formula given in the Mathematica documentation uses a k, which appears to be a function. I'd like the PDF version of the histogram. The smooth histograms that I generate using SmoothHistogram look good. Does anyone know the function k used for the PDF flavor of SmoothHistogram, or alternatively...