Convenience functions that wrap existing ggplot2 code. This file shouldn't contain new functionality, just code that can be replicated with longer calls to standard ggplot2 functions. Draw horizontal line at the origin (y=0)

Equivalent to geom_hline(yintercept = 0, linewidth = getOption("fedplot.linewidth_adj"), lineend = "round")

Usage

geom_hline_zero(...)