Shannon entropy Score: offset of x-axis

Following the instructions given in: http://thegrantlab.org/bio3d/html/entropy.html

Given that my alignment dimensions are: 9 sequence rows; 143 position columns (112 non-gap, 31 gap) and

length(con$seq) [1] 143

I've set: barplot(H, border="white", ylab = "Entropy", space=0, xlim=c(0.0, 143.0),yaxt="n" ) and axis(side=3, at=(seq(0,length(con$seq),by=5)-0.5), labels=seq(0,length(con$seq),by=5))

For plot2 the axis is set as: axis(side=3, at=c(1:length(con$seq)), labels =con$seq)

I'm attaching the generated image where it can be seen that the x-axis of the barplot is not the same as the x-axis of the image.

I experimented by changing the offset from -0.5 to different values to no avail.

Any suggestions as to the origin of the problem would be most useful.

Thank you in advance

George

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