Blueshifted Brγ line maps of X8 in 2006 and 2012. A scale valid for all images is given in the top left panel. The last row shows the stacked result of 2006 and 2012 with an averaged position of Sgr A* (white cross) that is based on the years we present. The red lobe column represents the wavelength range of 2.16455 μm–2.16516 μm. The blue lobe results cover a wavelength range of 2.16394 μm–2.16455 μm. For the last column, we select the wavelength range of 2.16394 μm–2.16516 μm so that both lobes are visible.