UARS/SUSIM at 239.5 nm as provided by the instrument team and the 16 σ thresholds (dashed). All points outside of the thresholds are marked as outliers, replaced by linear interpolation. Further possible outliers are selected and handled in Section 4.4. We define their uncertainties as the difference from the original data to the interpolated points. In the case of SUSIM, these outliers occur directly after instrumental data gaps, giving further credence to the possibility of instrumental, non-physical, outliers.