LegendLabelSpace

As of Version 9, all the functionality of the PlotLegends package is built into the Wolfram System. »

LegendLabelSpace

is an option for Legend that specifies the space for LegendLabel.

Details and Options

To use LegendLabelSpace, you first need to load the Plot Legends Package using Needs["PlotLegends`"].
The following settings can be given:
s a number giving the ratio of a key box size (see LegendTextSpace)

Automatic determine the space automatically

Wolfram Language code: Needs["PlotLegends`"]

Allow an automatic amount of space around the legend's label:

Wolfram Language code:

Plot[{Sin[x], Cos[x]}, {x, 0, 2Pi}, PlotLegend -> {"sine", "cosine"}, LegendLabelSpace -> Automatic, LegendLabel -> "Curves"]

Tighten the space around the legend's label:

Wolfram Language code:

Plot[{Sin[x], Cos[x]}, {x, 0, 2Pi}, PlotLegend -> {"sine", "cosine"}, LegendLabelSpace -> 1 / 3, LegendLabel -> "Curves"]

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	s	a number giving the ratio of a key box size (see LegendTextSpace)
	Automatic	determine the space automatically