Comparison of optical and X-ray spectral slopes for the cases where spectral break is found to lie in the analysed spectral range. Our values (empty red squares) are compared to the sample of Zafar et al. (2011) (filled black circles). Dashed line represents the relation βX = βO + 0.5, corresponding to a theoretical prediction in the case the observed break is the cooling break. The data point corresponding to GRB 130427A, for which the break probably does not correspond to a cooling break, is plotted with filled square.
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