[R] shifting down ylab in a plot

[statquant2]

Hi guys,
I am trying to shift down the "ylab" of my plot but can't find how to do it.
I tried to tune "mar" but it enable more room for the labels to be displayed
but it does not move to "ylab" as I would like.

Is there a way with "par"  to shift down my "ylab" ??

Cheers
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