Deprojection by a varying moving bin. The bin width varies between 20 and 40 km s⁻¹ dependingon the slope. The obtained distribution is finally smoothed out by a bin width 20 km s⁻¹. We performed several realizations of a sample projected from an initial two-Gaussian peaks distribution with respective peak positions 70 and 150 km s⁻¹ and standard deviations 15 and 20 km s⁻¹ (N_v ≈ 12 000 points, N_s = 25 realizations). We show the initial distribution as a red continuous curve. Despite the narrowness of the peaks, the quality of the deprojection is very good since the two peaks and the intermediate hollow are clearly identified at their true positions.