Post hoc analysis comparison results of FSI. Panel a: Comparison image near perihelion on April 6, 2024, with red and blue dashed circles extracting intensity distributions at 1.05 solar radii from the original and reconstructed images. Results are shown in the right panel. Panel b: Comparison image near aphelion on January 9, 2024, with red and blue dashed circles extracting intensity distributions at 1.05 solar radii from the original and compressed images. Results are displayed in the right panel. Panel c: Correlation coefficients of intensity distributions at 1.05 solar radii between original and reconstructed images under three different error bounds, based on 2.5 years of FSI data.