Dust optical depth derived from this study using theIRASand Planck- HFI frequencies. The square symbol shows the emissivity at 250μm derived by Boulanger et al. (1996). The dash and dash-dot lines show a power law emissivity with λ-1.8 and λ-1.75 respectively, normalized to the data at 100μm. The error bars shown are ± 1σ.
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