Top two panels: evolution of the scale lengths before the IGM attenuation correction on Lyα. In this study, only LAEs with MUV<−18.5 and log LLyα> 42.2 are used for fair comparisons at 2.9 <z< 6.6 (see dashed lines in Fig. 6). The black dashed curves show the best fit to our data points expressed as A × (1 + z)ξ, while the blue curves shows the best fit obtained in Zheng et al. (2014) with a compiled sample of LAEs at 0 <z< 7 that has different selection functions. The ξ value indicates the significance of the redshift evolution of the scale lengths. The bottom two panels indicate the evolution of the scale lengths after the IGM attenuation correction on Lyα. Prescriptions of Inoue et al. (2014) were used for the IGM attenuation correction on Lyα. The meanings of the curves are the same as those in the top panels.
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