After the Monte Carlo simulation is done, the time series as well as the autocorrelation time (tau) for each observable are recorded in the path /simulation/results/ of the hdf5 file. (For example, /simulation/results/observable/timeseries/data gives the time series.) I have two questions:

1. What determines the length of the time series array? In my experience its typical size is around 100. How does ALPS decide to cut the array?

2. If the binning method is not specified, what's the default way of calculating tau? I've tried to calculate the integrated autocorrelation time using the recorded time series, but it's not exactly same as tau given by ALPS.

Thank you.