def f_unlock(self):
self._locked = False<EOL>
Unlocks the locked parameter.

        Please use it very carefully, or best do not use this function at all.
        There should better be no reason to unlock a locked parameter!
        The only exception I can think of is to unlock a large derived parameter
        after usage to subsequently call :func:`~pypet.parameter.BaseParameter.f_empty`
        to clear memory.