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add url at the lower border of the sticker
geom_url( url = "www.bioconductor.org", x = 1, y = 0.08, family = "Aller_Rg", size = 1.5, color = "black", angle = 30, hjust = 0, ... )
url
x position of url
y position of url
font family
size of url
color of url
angle of url, default is 30
horizontal adjustment
additional parameters to geom_text
geom layer