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The high-statistics Belle data on the \gamma\gamma\to\pi^+\pi^- and \gamma\gamma\to\pi^0\pi^0 reactions have been jointly analyzed.
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We verify that, if the approximation includes the contribution from the D λ = 0 D_{\lambda=0} wave; i.e., if the expression | a + c d 00 2 ( θ ) | 2 + | b d 20 2 ( θ ) | 2 |a+c\,d^{2}_{00}(\theta)|^{2}+|b\,d^{2}_{20}(\theta)|^{2} with four free parameters is used to describe the angular distributions, it is impossible to reliably determine the absolute value and relative phase of the amplitude c c , because this expression does not provide any noticeable improvement to the approximation. Note that the so-called SD and SDG approximations used in [5] lead to the choice of the nonphysical values of the parameters and, as a result, to negative differential cross sections (see Fig. 7 in [5]). For this reason, they cannot provide a reliable tool for the partial wave analysis
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