Hi Marna,
I prepared this toy example that should help you.
x <- seq(1:100)
y <- x*x
avg <- mean(y)
avg.v <- rep(avg,100) # your average column data
df <- as.data.frame(cbind(x, y, avg.v))
library(ggplot2)
ggplot(data=df[,-3], aes(x=x, y=y)) + geom_line() +
geom_line(data=df[,c(1,3)], color='blue', aes(x=x, y=avg))
Best,
--
GG
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