ggplot: remove lines at ribbon edges

Question

I am using ggplot to plot time course data (fixation proportions over time to different objects on the screen) and want to use a ribbon to show the SE, but the ribb

Answer 1

ggplot2's geom_ribbon() now includes an outline.type argument that helps control how the ribbon outlines are displayed.

Outline Type

library(tidyverse)

huron <- tibble(year = 1875:1972, level = as.vector(LakeHuron))

huron %>%
    ggplot(aes(year, level)) +
    geom_ribbon(aes(ymin = level - 1, ymax = level + 1), 
                fill = "grey70", color = "red", 
                outline.type = "lower") +
    geom_line(aes(y = level))

^{Created on 2020-05-28 by the reprex package (v0.3.0)}

Linetype = 0

Alternatively, as suggested we can set linetype = 0 to remove all lines.

library(tidyverse)

huron <- tibble(year = 1875:1972, level = as.vector(LakeHuron))

huron %>%
    ggplot(aes(year, level)) +
    geom_ribbon(aes(ymin = level - 1, ymax = level + 1), 
                fill = "grey70", color = "red", linetype = 0) +
    geom_line(aes(y = level))

^{Created on 2020-05-28 by the reprex package (v0.3.0)}