As we saw with Figs. 4͑a͒ and 4͑b͒, the probability distribution shown in Fig. 6͑a͒ looks qualitatively the same as the probability distribution shown in Fig. 6͑b͒ . Using the Kullback-Leibler divergence given by Eq. ͑23͒, we have found that the two histograms shown in Figs. 6͑a͒ and 6͑b͒ have a relative entropy of d KL = 0.0953. Since this value is close to zero, the two histograms are quantitatively very similar.