Cumulative fluences along the NS54 mission. The left panel shows the raw datasets (our model in blue, NS54/CXD2R data in red, AE9 in green). The right panel shows the same fluence with both models calibrated to have the same median long-term average as the observation data. In each plot, the thick solid lines present the median values and the dashed lines present the 10th and 90th percentiles.