 load('example/example_data/33029_daily.mat');
   Q = data.Q;
   t = data.t;
   subperiod = [11:12, 1:4];
   [Q_sub, t_sub] = ...
       util_ExtractSubPeriod(Q, t, subperiod);

   References
   Euser, T., Winsemius, H.C., Hrachowitz, M., Fenicia, F., Uhlenbrook, S.
   and Savenije, H.H.G., 2013. A framework to assess the realism of model
   structures using hydrological signatures. Hydrology and Earth System
   Sciences, 17 (5), 2013.

   Copyright (C) 2020
   This software is distributed under the GNU Pub