Lyα(Lyα) × Lyα(Lyα) function in four ranges of μ = r_∥/r values, computed in a low-redshift (blue dots) and in a high-redshift (red dots) bin obtained by splitting our sample so that the two bins have equivalent statistical power. The dashed lines correspond to the simple fits to the data of the Lyα(Lyα) × Lyα(Lyα) correlation function, the solid line to the combining fits to the data of the Lyα(Lyα) × Lyα(Lyα) and Lyα(Lyα) × Lyα(Lyβ) correlation functions.