HD 207129 spectral energy distribution. Red data points are the PACS and SPIRE photometry, black data points are the ancillary data, including the Spitzer IRS spectrum. Error bars are 1 σ and include both calibration uncertainty (10% for 70/100 μm, 20% for 160 μm) and sky noise. Some error bars are smaller than the data point symbol. For wavelengths longer than  ~30 μm the solid line represents a disc model with a λ₀ = 210   μm and β = 1, the dashed line represents a disc model with a λ₀ = 63   μm and β = 2.7 and the dotted line represent the stellar photosphere.