[R] Removing X and Y labels in graph error

[poolmunch]

Hello, had a quick search on the site but no luck.

Heres my problem, when attempting to xlab = NULL and ylab = NULL it displays 

x[[1L]] and X[[2L]] as labels on the axis.

plot(USSenate[,1:2],col=c("blue","grey","red")[unclass(USSenate$Senate)],pch=unclass(USSenate$Senate),
type="n",xaxt="n", yaxt="n",main = NULL, sub = NULL, xlab = NULL, ylab =
NULL)




Ive been able to get rid of it by xlab = " " but this is not satisfactory as
the graph size must change as well.

Thanks to anyone who has a look at what must be a stupid question... 
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