when will it be useful to have a key\legend for graph
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it is useful to have a key or legend on a graph when 1 unit is not equals to 1.
i.e., if there are the numbers 30 40 50 60, the legend should be 1 unit is equals to 10 units
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Keys or legends are necessary in a graph when we have more than one data set in a single graph. It is used to denote what each data set stands for.
Keys can be used in two modes:
Horizontal- to fit in the margins of the chart
Vertical- to fit over the chart.
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