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Updated Share a legend between two ggplot2 graphs (markdown)
Added nrow and ncol arguments for specification of layout. Load grid as it is required for unit.c.
Add the function grid.arrange.shared.legend
g_legend used p1 within ggplot_build, it now uses a.gplot
Sorry if this edit is not useful. Could this function be called by the opts(keep="legend_box")?
title Updated Share a legend between two ggplot2 graphs (markdown)