Add Legends to Plots

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legend(x, y, legend, fill=, col="black",
        lty=, pch=, bty="o", bg=par("bg"),
        xjust=0, yjust=1)

`x`	the x location of the legend.
`y`	the y location of the legend.
`legend`	a vector of text values to appear in the legend.
`fill`	if specied, this argument will cause boxes filled with the specified colors to appear beside the legend text.
`col`	the color of points or lines appearing in the legend.
`lty`	the line types for lines appearing in the legend.
`pch`	the plotting symbols appearing in the legend.
`bty`	the type of box to be drawn around the legend.
`bg`	the background color for the legend box.
`xjust`	how the legend is to be justified relative to the legend x location. A value of 0 means left justified, 0.5 means centered and 1 means right justified.
`yjust`	how the legend is to be justified relative to the legend y location. A value of 0 means top justified, 0.5 means centered and 1 means bottom justified.

This function can be used to add legends to plots. Note that a call to the function locator can be used in place of the x and y arguments.

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