Corrected spectra from the same slit position as shown in Fig. 2. Panel a: IRIS data. Panel b: SPICE data. Panel c: Correction applied to the degraded IRIS data. Panel d: Correction applied to SPICE. The last two panels have the same pixel scale as the input SPICE data with a “nominal” PSF applied as well. The “raw” corrected data (Fig. 11) is at a higher resolution, which is necessary to resolve the spectral line. This over-resolution results in some noise-induced ringing and other ripples in the SPICE data. These effects were resolved in the figure by returning the image to SPICE pixel scale plus a “nominal” PSF. The original IRIS line width was recovered, while the elongation and tilt of the SPICE PSF was removed.