I would like to remove the grey (which is there because of the SE from geom_smooth) from the legend boxes. I would like to keep the SE in the actual plot though. So in the legend boxes, I just want the color of the lines, not the shadings. Here is an example:
library(ggplot2)
x <- rnorm(100)
y <- rnorm(100)
g_ <- sample(c("group1", "group2"), 100, replace = TRUE)
ggplot(data.frame(x, y, g_), aes(x = x, y = y, color = g_)) + geom_smooth()