Recovered Ω_p for two tests. The y-axis represents the value of the pattern speed, and the x-axis represents the minimum age of the stellar objects considered for the computation; hence, for x = 10 we consider objects with age ≥10 Myr. The dash-dotted lines represent the imposed value and dots represent the recovered value. The dotted red line shows the mean circular velocity of the stellar objects. Panel a: Test 1. Imposed Ω_p = 50 km s⁻¹ kpc⁻¹. Blue dots show the recovered Ω_p value when considering the present-day spiral arm defined by the HMSFRs, while green dots represent the recovered value when the present-day arm is defined with 10 Myr clusters. Panel b: Test 2. Pattern speed obtained for the cases of Ω_p = 20 and 50 km s⁻¹ kpc⁻¹: orange and blue, respectively. Dots show the recovered value, including error bars.