Present day oxygen abundance gradients for different azimuths, predicted by chemical models with spiral multiplicity m = 2 and different spiral pattern speed Ω_s (see Table 1 for model details). In each panel the dashed vertical line indicates the location of the co-rotation radius. It is clear that allowing for multiple spiral patterns propagating through the disc at the same time affect the entire disc, similarly to the case of the MCM13 model.