Temperature gradient of FU Ori over the inner disk. The temperature and location of the inner radius of the disk are 5800 K and 0.015 au, respectively. The dashed line represents the inner disk edge. The vertical profile of the disk schematic is not to scale, nor does it represent the vertical temperature structure of the disk. INSET-left: linearly polarized intensity, scattered light image obtained with the Gemini Planet Imager (GPI) in the J-band (Laws et al. 2020). The image is centered on FU Ori N within the black circle. FU Ori S is also visible to the South-West. INSET -right: brightness distribution of the TGM disk model in the J-band, as derived in this work. In both panels, we plot normalised surface brightness with a logarithmic colour scale. The white lines in the image indicate the position angle of the disk minor-axis derived from other observations in literature and in this work.