Box plots. R code:
> png("kaxadiagrama_0001.png")
> par(bty="n")
> plot.new()
> x=c(38,39,42)
> y=c(10,20,20)
> plot(x,y,xaxt="n",yaxt="n",xlim=c(15,45),ylim=c(0,30),pch=19,xaxs="i",yaxs="i",xlab="Denbora (minututan)",cex.lab=0.8,ylab="")
> axis(1,at=c(20,22,24,26,28,30,32,34,36,38,40,42,44),
labels=c("20","22","24","26","28","30","32","34","36","38",
"40","42","44"))
> polygon(c(22,22,26.5,26.5),c(8,12,12,8),border=TRUE)
> polygon(c(25.75,25.75,30.5,30.5),c(18,22,22,18),border=TRUE)
> a=c(24,24)
> b=c(8,12)
> lines(a,b)
> c=c(29,29)
> d=c(18,22)
> lines(c,d)
> e=c(20,22)
> f=c(10,10)
> lines(e,f)
> g=c(26.5,33.25)
> lines(g,f)
> h=c(24,25.75)
> i=c(20,20)
> lines(h,i)
> j=c(30.5,37.625)
> lines(j,i)
> text(18,10,"Kepa")
> text(18,20,"Ana")
> title("Kaxa-diagramak")
> dev.off()