Here is a working example that allows you to interactively label curves where
you want:
x <- c(200,210,230)
y1 <- c(0.1, 0.13, 0.1)
y2 <- c(0.11, 0.15,0.1)
y3 <- c(0.12,0.17,0.12)
df <- data.frame(x, y1,y2,y3)
lab <- c("0.1 mg/l","0.2 mg/l","0.3 mg/l")
plot(df$x, df$y1, type="l", col="blue", xlab="", ylim=c(0,.25))
points(df$x, df$y2, type="l", col="grey")
points(df$x, df$y3, type="l", col="green")
text(locator(3), lab, adj=0)
--
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