The method allows picking the cumulated heat flow at one or more defined sample ages, optionally taking into account an initial time frame discarded from the analysis via the cutoff_min-keyword. Again, the method returns a pandas.DataFrame as its result. get_dormant_period_heatflow() This method picks the dormant period's heat flow as the minimum heat flow value observed in the time range before the first temporal peak found via get_peaks()and a cutoff_min time defaulted to 5 min. Again, the method returns a pandas.DataFrame as its result.