def _expand(self, iterable):
raise NotImplementedError("<STR_LIT>")<EOL>
Similar to :func:`~pypet.parameter.BaseParameter._explore` but appends to
        the exploration range.

        :param iterable: An iterable specifying the exploration range.

        :raises:

            ParameterLockedException: If the parameter is locked

            TypeError: If the parameter did not have a range before

        Example usage:

        >>> param = Parameter('groupA.groupB.myparam', data=3.13, comment='I am a neat example')
        >>> param._explore([3.0,2.0,1.0])
        >>> param._expand([42.0,43.0])
        >>> param.f_get_range()
        (3.0,2.0,1.0,42.0,43.0)

        ABSTRACT: Needs to be defined in subclass