[R] transparency in segments()

Dear all, i would like to plot each value from my datasets as segment with defined transparency However, I didnt find out how to set the transparency. definition by "col=" in par() or segments() doesnt seem to work any suggestions? Thanks in advance. Kind regards, Robert Pazur example

[R] swap hist() colours

side =TRUE,ylim=c(0,250)) abline(v=(6),col = "black", lty=3, xpd= F) abline(v=(17),col = "black", lty=3, xpd= F) abline(v=(28),col = "black", lty=3, xpd= F) f <- c(11.5,22.5) axis(1, f,labels = FALSE) box() ### Robert Pazur [[al