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Each reference source (SORTIE, TIPSY, VDYP) keeps the same linetype on every figure, whichever sources a figure draws.

Usage

scale_linetype_growth_reference(sources = NULL)

Arguments

sources

Character or NULL. The reference sources the plot draws; only these get a legend key. NULL (the default) keys every source, drawn or not.

Value

A ggplot2 scale.