@property<EOL><INDENT>def A(self):<DEDENT>
return self._A<EOL>
Property of AplusBT parameter A.

        :getter:    Returns the parameter A which is stored in attribute
                    ``self._A``
        :setter:    * sets parameter A which is addressed as ``self._A``
                      to the new value
                    * updates the parameter dictionary ``self.param['A']``
        :type:      float

        :Example:

            ::

                >>> import climlab
                >>> model = climlab.EBM()

                >>> # getter
                >>> model.subprocess['LW'].A
                210.0
                >>> # setter
                >>> model.subprocess['LW'].A = 220
                >>> # getter again
                >>> model.subprocess['LW'].A
                220

                >>> # subprocess parameter dictionary
                >>> model.subprocess['LW'].param['A']
                220