Mean emissivities for the full HeViCS coverage. Filled circles and solid lines refer to the estimates for ϵ^LVC and their (variable β) MBB fits, respectively; open circles and dashed lines refer to ϵ^IVC. The error bars show the standard deviation of the mean. The red squares are the COBE-DIRBE and Planck-HFI emissivities derived in the southern Galactic pole (Planck Collaboration Int. XVII 2014); the red dotted line is the fit to Planck high-latitude emissivities (Planck Collaboration XI 2014); the gray line and error bars refer to the high-latitude emissivities from FIRAS (Compiègne et al. 2011).