Posterior analysis of all data by fitting for f_SP simultaneously with all other parameters. As in Fig. B.2, the bottom panels show the residuals in RA (left) and Dec (right) between the data and the best-fitting GR (thick red curve, f_SP = 1.1), relative to the same orbit for f_SP = 0 (Newton, plus Rømer effect, plus SRT, plus RS). Grey crosses denote individual NACO or SINFONI data, cyan filled black circles show averaged GRAVITY data, and grey rectangles denote averages of the NACO data. Top right panel: same for δφ, and top left panel: for δvz. Blue filled black circles are averages of the SINFONI residuals, with all residuals shown as grey crosses. The best fit (red curve) including the flare data (Fig. 1) has f_SP = 1.1, with a 1σ uncertainty of 0.19. The overall reduced of this fit is 1.5.