Parallax diagram of the primary (A) and secondary (B) components of the 15 new binary systems in Table A.1 with parallactic information in both components, colour-coded by spectral type. Bottom panel: normalised difference between both parallaxes, i.e. ∇ϖ=(ϖ_B − ϖ_A)/ϖ_A. Grey empty circles are the 134 previously known pairs in our sample with parallactic information for both components and angular separation of ρ <  5 arcsec. The black dash-dotted and dashed lines mark the 1:1 and 1:1 ± 0.05 (i.e. 5% difference), respectively. Two slight outliers from our list of binary candidates are labelled with their common names.