Dust model at 545  GHz. The dust template is based on the G60–G41 mask difference of the 545 GHz half-mission cross-spectrum (blue line and circles, rescaled to the dust level in mask G60). Coloured diamonds display the difference between this model (rescaled in each case) and the cross half-mission spectra in the G41, G50, and G60 masks. The residuals are all in good agreement (less so at low ℓ, because of sample variance) and are well described by the CIB+point source prediction (orange line). Individual CIB and point sources contributions are shown as dashed and dotted orange lines. The red line is the sum of the dust model, CIB, and point sources for the G60 mask, and is in excellent agreement with the 545 GHz cross half-mission spectrum in G60 (red squares). In all cases, the spectra were computed by using different Galactic masks supplemented by the single combination of the 100 GHz, 143 GHz, and 217 GHz point sources, extended objects and CO masks.