Gmx saxs reports intensities at different wavelengths for two different systems

GROMACS version:2021
GROMACS modification: No
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gmx saxs calculates intensity for different wavelengths for wild type and mutant protein trajectories. How to get the intensity for same wavelengths, to compare SAXS of the two trajectories? I had used
gmx saxs -s em.tpr -f traj.xtc -sq saxs.xvg and chose “0” for system