I need to modify the graph of the autocorrelation. I tried to do it through plot.acf but with no success. 

1. I would like to get rid of the lag zero
2. I would like to have numbers on the x-axis only at lags 12, 24, 36, 48, 60, ...

Could anybody help me in this?

Any help will be appreciated
Thank you for your attention
Stefano


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