@property<EOL><INDENT>def c200(self):<DEDENT>
if self._c200 is None:<EOL><INDENT>raise AttributeError('<STR_LIT>')<EOL><DEDENT>else:<EOL><INDENT>return self._c200<EOL><DEDENT>
Cluster concentration parameters.

        c200 is calculated from m200 and z using the mass-concentration
        relation specified when ClusterEnsemble object was created (default
        is relation from Dutton & Maccio 2015). Note that c200 = r200/rs.

        :property: Returns c200
        :type: ndarray