CO(3−2) spectrum of the central 1 × 1 arcsec² region centred on PDS 456. Data are shown in grey together with the total best-fit model resulting from the pixel-by-pixel decomposition in the v ∈ [ − 500, +600] km s⁻¹ range, obtained by adding the best-fit models of each pixel. Yellow and green histograms indicate the two rotation components used to model the CO(3−2) core, while the emission from H¹³CN at v ∼ +390 km s⁻¹ is shown in purple. The red histogram represents the best-fit of the low-velocity outflow component. The red shaded area represents the emission, remaining after the subtraction of rotation and H¹³CN emission, which we consider to be associated with the outflow, and indicates the presence of a blue-shifted, high-velocity (v ∼ −800 km s⁻¹) outflow component.