• Level 3 FITS file
• Extension 0 - Results (Fit components and parameters)
• Extension 1 - Data
• Extension 2 - Lambda
• Extension 3 - Weights
• Extension 4 - Includes
• Extension 5 - Constants
• Extension X - Residuals

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This extension is not saved in the FITS file, since it can be reproduced using the fit parameters and the original data cube from the level 2 file.