Determine the origin of the residual step-up transition bump

Determine the exact origin of the small systematic bump that remains in two measured step-up transitions after clear-field–dark-field correction, in order to eliminate the need for manual data shifting and improve the robustness of the detector-lag measurement procedure.

Background

After applying the clear-field–dark-field correction, the authors observed a small systematic bump in two step-up transition measurements. They manually shifted the affected data to align the transitions, but identified several possible causes, including detector synchronisation, x-ray source fluctuations, calibration errors, and other experimental factors.

Because the exact source of this artefact remains unresolved, the authors explicitly call for a more detailed investigation in future work. Resolving it would improve the reliability and reproducibility of the long-duration detector-lag characterisation method.