All-sky maps of the fractional uncertainty (in percent) of the parameters of the MBB fit of Planck 353, 545, and 857 GHz and IRAS 100 μm data. Upper: optical depth at 353 GHz, τ353, at 5′ resolution. Middle: observed dust temperature, Tobs, at 5′ resolution. Lower: observed dust spectral index, βobs, at 30′ resolution.
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