Time series standard deviation in fluent
 

I have a case with transient oscillating flow.
I would like to calculate the mean and standard deviation of the velocity at some point.
If I enable "Data Sampling for Time Statistics" I can get the Mean velocity magnitude from the Unsteady statistics... functions.
But I can't find a way to calculate the standard deviation (which is different from the RMSE value).
Any ideas if this can be done?