sm.regression(num2,Spring1,
df=3.8, model= "no effect", col.band= hcl(0,50,100,fixup=TRUE),pch=19,cex=1.5,col=2,xlab="Year",
ylab="Air temp (°C)",ylim=c(10,16))
par(new=TRUE)
sm.regression(num2,Spring2,
df=3.8, model= "no effect", col.band= hcl(120,50,100,fixup=TRUE),pch=17,cex=1.5,col=4,xlab=" ",lty="longdash",
ylab=" ",ylim=c(10,16))