a) SEDs for the central pixel of the cloud with central A_V = 10 for a mixture of LamC and aSil (black), LamC and ENSTA (magenta), LamC and OLIVA (blue), ACAR and aSil (red), BE and aSil (green). b) Emissivity normalised at 100 μm for the cloud with central A_V = 10, for a mixture of LamC and aSil (black solid line), of ACAR and aSil (red solid line), and of BE and aSil (green solid line). Absorption efficiencies normalised at 100 μm: aSil (black dotted line), LamC (black dashed line), ACAR (red dashed line), and BE (green dashed line). c) Emissivity normalised at 100 μm for the cloud with central A_V = 10, for a mixture of LamC and aSil (black solid line), of LamC and ENSTA (magenta solid line), and of LamC and OLIVA (blue solid line). Absorption efficiencies normalised at 100 μm: aSil (black dotted line), LamC (black dashed line), ENSTA (magenta dashed line), and OLIVA (blue dashed line).