Print a density profile of the data for each chromosome. You have to provide the reference genome, to know the sizes of the chromosomes. You can also provide the number of points (called bins) you want per chromosome.
By default, only one curve is plotted per chromosome, but you can plot one curve per strand and per chromosome (the minus strand will be plotted with non-positive values on the y-axis).
If you want, you can also plot a specific region, by mentionning the chromosome, the start and the end positions of the region.