Get rid of auto spacing using bquote in r

If you want to get rid off space on either side of mu

i <- 25plot(1, xlab=bquote("Lake NO3 ("*mu*"mol/L): " ~.(i) ))

If you need space on the right

plot(1, xlab=bquote("Lake NO3 ("*mu~ "mol/L): " ~.(i) ))

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