Fig. 4
Contribution functions of the EW at disc-centre, defined in a way that their integral over log τλ gives the EW (Magain 1986), for the Cu i 324.7 nm line and the model d3t63g40mm20n01 for two different values of Cu abundance. In the upper panel A(Cu) = 0.2, in the lower panel A(Cu) = 1.7. The solid lines refer to the 3D model, the dashed lines to the corresponding 1DLHD model.
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