[R] Meaning of "lag 0.2, 0.4,..." ?

[Bogaso]

Please see that correlogram for a arbitrary time series :

acf(zooreg(rnorm(39), start=as.yearmon("2008-01-01"), frequency=12))

What is the meaning of lag 0.2, 0.4, ........ in the plot? Those should not
be integers? Or I am missing something?

Thanks
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