Context images of the primary IRIS and SPICE observations used for demonstration and testing in this paper. Left panel a: Context image of the SPICE-IRIS coordinated observation data. The image was made from one of the full-size SPICE rasters. It is a spectral sum over the C III 977 Å window. The detailed comparisons in this paper focus on the smaller region outlined in this image. Upper-right panel b: Spectral line fit amplitude image of the smaller region from IRIS. Lower-right panel c: Spectral line fit amplitude image of the smaller region from SPICE.