a) SEDs for the central pixel of the cloud with central A_V = 10 for a mixture of LamC and aSil (black), BE and ENSTA (green), BE and OLIVA (magenta), ACAR and ENSTA (blue), and ACAR and OLIVA (red). b) Emissivity in arbitrary units for the cloud with central A_V = 10, for a mixture of ACAR and OLIVA (solid grey line), and a mixture of ACAR and ENSTA (solid black line). Absorption efficiencies in arbitrary units for grains with a diameter of 0.1 μm: ACAR (dotted line), ENSTA (dashed line), and OLIVA (dashed-dotted line).