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g + scale_x_datetime(expand=c(0,0), breaks=pretty_breaks(n=20)) +
geom_hline(yintercept=55) +
geom_ribbon(ymin=0, ymax=55, fill="#abcbc9", alpha=0.5) +
geom_ribbon(ymin=55, ymax=100, fill="#e3a6a1", alpha=0.5)