Mass-ratio distribution for barium stars as derived from the Lucy-Richardson inversion method. A Gaussian fit centred on q = 0.33 and with σ = 0.065 is shown for comparison (dashed red curve). The upper horizontal scale gives the WD mass, adopting 2.3 M⊙ for the average mass of the giant star and 0.3 M⊙ for its standard deviation. The error bars are 1σ errors, based on 1000 Monte Carlo simulations.
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