Fig. 4.
Cross section of three dimensional parameter space calculated for the bump width σ = 0.2 μm. The cross sections of 95% confidence level upper bound and the 68% confidence level contour around the best-fit value for the normalisation of the log-Gaussian EBL bump as a function of the central wavelength are shown with grey and green correspondingly. The data of 1ES 1218+304 are used. Blue star shows the measurement of the minimal EBL bump by CIBER (Matsuura 2017).
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