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Show entire legend even when a category is not displayed in the graph...

rggplot2scale-color-manual

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Changing default plot colors in R for categorical values...

rggplot2scale-color-manual

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How to draw different colors on graph line and insert legend (color and column title)...

rggplot2graphcolorsscale-color-manual

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Add legend to ggplot2 line with point plot...

rggplot2legendscale-color-manual

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