Astrometric extraction example for the J1036BC binary. The upper plots display the observed AstraLux data for the binary pair and a PSF reference. The lower plots show the constructed model using two brightness-scaled and position-shifted PSF models, and the residual after subtracting the model from the observed data. The plots here have been normalised to the peak value of the observed data, are scaled linearly in the plots. The colour-bar markers indicate the peak and bottom values for the observed data. The residual for the AstraLux is typically of the order of ±15%, whereas with SPHERE the residual is more commonly around ±1%.