[R] Change breaks x axis in plot

[Luis Fernando García]

I have the following graph:
 my problem is the scale, I just need it to show the values for 1 and 2 and
remove the intermediate values (1.2,1.4,1.6,1.8). How could I do it? I'm,
attaching the script code for the plot.

Thanks in advance

###AV=mean values
##SD=Sd values


plot(D ~ ferre$Cantidad, type="n",ylim=range(0:1.5))
points(AV, pch = 16, cex = 1.5)
arrows(x0 = AV$Group.1, y0 = AV$x, x1 = AV$Group.1, y1 =AV$x + SD$x, angle
= 90)
arrows(x0 = AV$Group.1, y0 = AV$x, x1 = AV$Group.1, y1 =AV$x - SD$x, angle
= 90)

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