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...econd y axis....because this can only be done within a plot statement and my attempts to add the label as text didn't work because the "locator" refers to the plot area.... Any thoughts greatly appreciated. Thanks in advance, Sion >par(mai=c(1,1,1,1.5)) >plot(time[DOY<230],Hmeas[DOY < 230],ylab=expression(paste("Fluxes, W",m^-2)),xlab="Time of Day, hours",ylim=c(-100,500),typ="l",lty=1,lwd=1,col=1,axes=F) >axis(2,at=c(-100,0,100,200,300,400,500),tick=T) >axis(1,at=c(0,6,12,18,24),tick=T) par(new=T) >plot(time[DOY<230],Ueddy[D...