Top: amount of global attenuation in the GRBH in the V band as a function of the amount of extinction in the V band along the GRB l.o.s. Middle: colour excess for the stellar continuum as a function of the colour excess for the Balmer lines. The grey line represents the C00 relation. Bottom: amount of attenuation of the Balmer lines in the V band as a function as the amount of extinction in the V band along the GRB l.o.s. For all panels the grey dash-dotted line represents the best fit using an orthogonal distance regression (using SciPy’s scipy.odr) and the grey shaded area its 1σ uncertainty. The χ2, number of degrees of freedom and Null Hypothesis Probability (NHP) of these fist are indicated.
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