Left: map of the power-law index α₂₅₀ , centred at 250 GHz, of the continuum brightness temperature in Orion (see Eq. (8)), after convolution to a resolution of 40 arcseconds, focussing on the Orion Centre. The power-law index is uncontaminated by the CO line. Contours indicate uncertainties of 0.3 (inner) and 0.6 (outer) for α₂₅₀ within one beam. The map is clipped at an uncertainty of 1. Right: map of the 250 GHz continuum in kelvins at a 40 arcsec resolution. The S/N is labelled on the contours in steps of 5, with a typical noise of 6 mK.