[R] R plot : hat symbol and cex.lab

[BMichel]

Hello,

Does anybody know how to make the "hat" correctly appears in the label of
this plot (with this cex.lab coefficient) :

plot(1:10, 1:10,ylab = expression(hat(h)),cex.lab = 1.5)

The "hat" does not completely appear on my graph, it is like cut on the left
side.
It tried to change the margin :

par(oma=c(0,2,0,0))
plot(1:10, 1:10,ylab = expression(hat(h)),cex.lab = 1.5)

but it doesn't work. Thanks for your help.

Bertrand 

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