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Table 1.

Parameters to create the models.

Scaling factor Sback = 25, 70, 115, 150%
d1 = 1300, 1650, 2000 AH1 = 0.05, 0.2, 0.35, 0.5
d2 = 2350, 2700, 3050 AH2 = 0.65, 0.8, 0.95, 1.1
d3 = 3400, 3750, 4100 AH3 = 1.25, 1.4, 1.55, 1.7
d4 = 4450, 4800, 5150 AH4 = 1.85, 2.0, 2.15, 2.3

Notes. The scaling factor scales the number of stars of the first spiral arm (or the total number of stars in the no-spiral-arms model to the 5000 stars chosen for each simulation). Three different values were tried, scaling the values in steps of 25% of the total number of simulated stars. Sback refers to the scaling factor of the background population (i.e. stars homogeneously distributed from 100 to 5000 pc with increasing extinction, see main text) with respect to the total number of stars belonging to the spiral arms. di and AHi indicate the distance and extinction to the ith spiral arm. The distances and extinctions are given in units of pc and mag, respectively.

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