Observed and best-fit fluxes vs. wavelength for the two binary systems in our sample, HD 140494 (V973 Sco) and HD 37043 (ι Ori). Colours, symbols and line types as in Figure A.4, except that in the HD 149404 diagram, the blue-dashed line represents also an alternative solution, whereas for HD 37043, together with the orange dashed-dotted line, they represent the best-fit models by P06. See comments on individual objects in Section A.5.