Lyα escape fraction as a function of the nebular dust extinction. The figure shows the z ~ 0.3 Lyα emitters of this work with black circles. We also derived f_esc(Lyα) for other galaxy samples: z ~ 0 IUE sample represented by blue triangles, z ~ 0.3 sample of Scarlata et al. (2009) with green circles, Cowie et al. (2011) sample with red circles, z ~ 0 galaxies of Atek et al. (2008) with purple squares. Note that the negative values of E(B − V) are shown in the plot but were assigned E(B − V) = 0 before f_esc(Lyα) calculation or fitting the f_esc–E(B − V) relationship. The left panel shows f_esc(Lyα) as a function of E(B − V) assuming a Cardelli et al. (1989) extinction law. The solid black line denotes the best 2-parameter fit to the relationship with both the slope and the intercept as free parameters. The yellow region covers the 1σ uncertainties of the fit derived from MC simulations. The dashed red line is the expected attenuation law at the Lyα wavelength. In the right panel we plot the normalized escape fraction f_esc,rel(Lyα) = log [f_esc(Lyα)/f_esc(cont)] as a function of extinction. The normalized escape fraction represents the deviation of f_esc(Lyα) from the classical dust attenuation law at 1216 Å. The color code for the samples is the same as in the left panel.