Fractional UV (black dots), optical (blue dots), NIR (green dots) and MIR (red dots) luminosity for SN 2011dh. The upper and lower error bars for the systematic error arising from extinction (dashed lines) and the fractional Rayleigh-Jeans luminosity redwards of 4.5 μm (red solid line) are also shown. The early MIR and late UV photometry was extrapolated assuming constant colour.