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Comment: Separated histogram from density. Clarified terminology and title

Histogram (density) plots

The histogram, or relative frequency, plot is the most commonly used in risk analysis. It is produced by grouping the data generated for a model's output into a number of bars or classes. The main advantage of a histogram plot is how easy it is to read the realistic range of the variable, its rough location, and any peaks. the

The density plot is similar to the histogram, but a smoothing algorithm is used to create a curve, with an area under the curve standardized to 1, so it's useful when overlaying multiple outputs.