r - Removing a white buffer within the graph -


i can't seem remove buffer on bottom (below green-low section) , top (above purple-extreme section) of data within graph.

uv radiation index city: enter image description here

i've tried extending rectangle down 0 , past 12, ggplot still adds white buffer. below code i'm using. feel free comment on other aspects of code if see better option used.

uv.plot.mean <- ggplot(data = uv.month.mean, aes(x = month, y = cloudy.sky.uvi, group = station.name, shape = station.name, color = station.name)) +    ### add in lines , adjust size of point shapes     geom_line() +   geom_point(size = 4) +    ### set axis labels   labs(x = "month", y = "uv index") +    ### change order of legend alphabetical, , make shapes , lines color blind friendly palette.     scale_color_manual(values = cb.cat, name = " ", labels = c("albuquerque", "atlanta", "boise", "buffalo", "charleston", "cheyenne", "denver", "memphis", "phoenix")) +   scale_shape_manual(values = shapes, name = " ", labels = c("albuquerque", "atlanta", "boise", "buffalo", "charleston", "cheyenne", "denver", "memphis", "phoenix")) +    ### adjust x axis it's chronologically in order instead of alphabetically     scale_x_discrete(limits = c("jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec")) +    ### set breaks on y-axis      scale_y_continuous(breaks = 1:12) +    ### add in color recatangles showing classification levels of uv radiation   annotate("rect", xmin = 0, xmax = 13, ymin = 11, ymax = 12, alpha = .1, fill = "purple") +   annotate("rect", xmin = 0, xmax = 13, ymin = 8, ymax = 11, alpha = .1, fill = "red") +   annotate("rect", xmin = 0, xmax = 13, ymin = 6, ymax = 8, alpha = .1, fill = "orange") +   annotate("rect", xmin = 0, xmax = 13, ymin = 3, ymax = 6, alpha = .1, fill = "yellow") +   annotate("rect", xmin = 0, xmax = 13, ymin = 1, ymax = 3, alpha = .1, fill = "green") +    ### add in text identifies levels of uv radiation   annotate("text", x = .5, y = 11.5, label = "extreme") +   annotate("text", x = .5, y = 8.5, label = "very high") +   annotate("text", x = .5, y = 6.5, label = "high") +   annotate("text", x = .5, y = 3.5, label = "moderate") +   annotate("text", x = .5, y = 1.5, label = "low") +    ### use black , white themed plot.   theme_bw() +    ### adjust axis , legend   theme(axis.title.x = element_text(face = "bold", size = 16),         axis.title.y = element_text(face = "bold", size = 16),         legend.title = element_text(size = 24),          legend.position = c(1.01, 1.0),          legend.justification = c(1, 1),          legend.text = element_text(size = 24),         legend.background = element_blank(),         legend.key = element_blank()) +    ### adjust plot background eliminating lines cross entire graph showing units of y axis.      theme(axis.line = element_line(colour = "black"),       panel.grid.major = element_blank(),       panel.grid.minor = element_blank(),       panel.border = element_blank(),       panel.background = element_blank())

thanks both @axeman , @zx8754 help. using expand = c(0,0)solved issue.


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