So I'm using R to perform a DCA (detrended correspondence analysis) through Vegan package and everytime I plot my results I get a grid in the middle of the plot.

I want to get rid of it.

Here is my code:

```
dca <- decorana(dados)

plot(dca, type = "n", ann = FALSE, origin = TRUE)
        text(dca, display = "sites")
        points(dca, display = "species", pch = 21, col="red", bg = "red", cex=0.5)
        mtext(side = 3, text = "Análise de Correspondência Retificada (DCA)", font=2, 
              line = 2.5, cex=1.8, font.lab=6, cex.lab=2, cex.axis=1.5)
        mtext(side = 1, text = "Eixo I", font=2, line = 2.5, cex=1.5, 
              font.lab=6, cex.lab=2, cex.axis=2)
        mtext(side = 2, text = "Eixo II", font=2, line = 2.5, cex=1.5, 
              font.lab=6, cex.lab=2, cex.axis=2)

```

And here is the result:
[DCA plot](http://i.stack.imgur.com/966Y0.png)

Do you see that grid line from x=0 and y=0? That's the problem.