Spectra from a particular slit position in the SPICE and IRIS data. This slit position was chosen for good agreement between SPICE and IRIS, and it passes through the middle of the green circled region in Fig. 1. Panel a: IRIS spectra. Panel b: Proposed SPICE PSF with SPICE pixelization. Panel c: IRIS data (“synthetic SPICE”) with this PSF and pixelization. Panel d: Actual observed SPICE data. The elongation and apparent rotation of the PSF are evident, as is the agreement between (synthetic) IRIS and SPICE.