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Fig. 2.
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Different snapshots of the temporal evolution of the new modulation function 
introduced in Eq. (11) for multiple spiral arm structures, assuming the same parameters as Model A reported in Table 1 and also characterised by multiplicity m = 2 spiral arms, fiducial radius R0 = 8 kpc, pitch angle α = 15°, and ϕ(R0) = 0.
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