Proper motion and parallax. Left: distribution of membership probabilities as a function of modulus of proper motion. A dashed line is used to separate members from candidates. Right: parallax distribution for the sample showing the observed values of ϖ and respective error bars. Green ♦ symbols indicate the sources found in the secondary structure of the cloud (see Sect. 5). The vertical blue lines indicate the error-weighted mean parallax ⟨ π ⟩ = 0.91 ± 0.02 mas (dashed lines show 3σ deviation).