Comparison of the spectral stacks of the sub-samples with Lyα_ext ≤ 5.7 kpc (cyan line) and with Lyα_ext > 5.7 kpc (purple line). The vertical lavender bands indicate the LyC range (870−910 Å) and the UV range (1420−1520 Å) where we have normalized each spectrum. The signal in the LyC range in the stack of the sub-sample with Ly α_ext≤ 5.7 kpc is about 2.5 times higher than that of the sub-sample with Lyα_ext > 5.7 kpc. The spectra in the figure have been smoothed by three times the step of the stacked spectrum, which is 1.06 Å for the stack of the sub-sample with Lyα_ext ≤ 5.7 kpc and 1.12 Å for the sub-sample with Lyα_ext > 5.7 kpc, to emphasize the difference in the LyC region between the two sub-samples.