Try
plot(1:10, xlab = expression(NO[3]^{'-'}~(mg/L)))
Hope this helps,
Rui Barradas
On 5/21/2018 1:09 PM, Jinsong Zhao wrote:
hi there,
I find the following codes produce strange output.
plot(1:10, xlab = expression(NO[3]^-~(mg/L)))
you will notice that the unit, mg/L is in superscript format.
That means that "~" is not for space.
However, the help page of plotmath does not mention this behavior.
Best,
Jinsong
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