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Fig. 3
Close-up of the Lyα forest towards ULAS J1120+0641, binned to a pixel size of 20 km s-1 for display purposes. Upper: spectrum (black) and 1σ errors (red). Lower: S/N at each pixel found by running the Gaussian matched filter at the narrowest width over the unbinned spectrum (pixel size 10 km s-1).
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