<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def _confirm_resolution(self, implemented_res):
        ''' Control on resolution '''

        assert self.ppd in implemented_res, \
            ' Resolution %d ppd not implemented yet\n.\
            Consider using one of the implemented resolutions %s'\
            % (self.ppd, ', '.join([f + ' ppd' for f in map(str, implemented_res)]))

        if self.ppd == 256:
            assert (np.abs(self.latM) < 60) and (np.abs(self.latm) < 60),\
                'This resolution is available in\n \
                in cylindrical geometry only for -60<latitude<60 '