Fig. 4

Left panel: change in pitch angle with respect to the pitch angle of the spiral in the gas, fitted using the function ϕ = ar + b between r = 1.6,1.8 rpl as a function of the Stokes number. The solid lines represent the change in pitch angle relative to the pitch angle in the gas and the dotted lines show the constant azimuthal offset between the spiral in the gas and the dust in degrees. Right panel: amplitude of the spiral versus the Stokes number at r = 1.7 rpl, normalized by the amplitude of the spiral in the gas.
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