def METHOD_NAME(self):
    self.ncfile_ml = Dataset(DATA_FILE_ML, 'r')
    self.ncfile_pl = Dataset(DATA_FILE_PL, 'r')
    self.ncfile_pv = Dataset(DATA_FILE_PV, 'r')
    self.ncfile_tl = Dataset(DATA_FILE_TL, 'r')
    self.ncfile_al = Dataset(DATA_FILE_AL, 'r')