Line profile of the hydrogen Balmer lines Hβ, Hγ, Hδ, Hζ at day +14 (top panel) and +25 (bottom panel) in the NOT/FIES spectra. The spectra were flux calibrated and the Hγ, Hδ, Hζ lines have been offset with respect to Hβ by the constants −0.5e-11, −1e-11 and −1.5e-11, respectively, in the +14 days spectrum and by the constants −0.75e-11, −1.5e-11 and −2.25e-11, again respectively, in the +25 days spectrum. Note the Balmer progression in the absorption trough: decreasing strength and velocity of the feature and increasingly fragmented structure with increasing series number.