@property<EOL><INDENT>def a0(self):<DEDENT>
return self._a0<EOL>
Property of albedo parameter a0.

        :getter:    Returns the albedo parameter value which is stored in attribute
                    ``self._a0``
        :setter:    * sets albedo parameter which is addressed as ``self._a0``
                      to the new value
                    * updates the parameter dictionary ``self.param['a0']``
                    * calls method :func:`_compute_fixed`
        :type:      float