Estimated PDF from the Tarantula sample (solid lines). Both panels with λ = 0.0174 and Δx = 2 km s^-1, Left panel with bandwidth h₁ = 35.676 and right panel with bandwidth h₂ = 30.313. Gray-shaded regions represent the 2.5% (lower) and 97.5% (upper) confidence intervals calculated using a bootstrap method. Dashed lines show the PDF (from Ramírez-Agudelo et al. 2013) obtained using the Lucy (1974) method.