As shown in the inset of Fig.57, the saturated relaxation rate  takes a maximum at the optimum doping concentration. The increase of in the Zn `under-doped' regime indicates a creation of static moments upon doping, being consistent with the suppression of and the enhancement of (Fig.53). The decrease of in the Zn `over-doped' regime is partly attributed to trivial dilution of moments due to the Zn substitutions; even if the size of ordered moments doesn't change upon Zn doping, the muon relaxation rate should decrease as ,simply because of the decrease in the number of spins. Still, the experimental result suggests more pronounced decrease; the relaxation rate decreased by %  in the change of Zn concentration %. This result suggests that the ordered moments shrinks in the Zn over-doped regime.