Fig. 5.
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Data and fitted phase-space density of the data sample with l ∈ [120, 130] deg and 
. All four panels span the same range of the (z, w)-plane and show: (a) the data histogram; (b) the fitted bulk and z-mask; (c) the spiral as seen in the data after removing the bulk and z-mask, where the dashed black line shows the boundary of the inner mask function; (d) the relative phase-space density perturbation of the best fit spiral.
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