Different transmission profiles () of the interference filter for the tilt angles used. The FTS atlas (Neckel 1999) is shown in red, together with the synthetic spectrum from HolMul with blends (black continuous line) computed at μ = 0.953. The filter profiles are normalized to the peak transmission of the narrowest profile in the plot, over the line core, that corresponds to the smallest tilt angle used. The large blend at 396.15 nm is from Al i.