Spectral profiles in all grating configurations of SPIFFIER, normalised by total flux. Each colour corresponds to a pixel scale (250 mas, 100 mas, and 25 mas in green, red, and blue, respectively) because this matches the largest variation when measured in pixels. For each pixel scale (or colour) there are 12 measurements corresponding to band (J, H, K) and grating (low, short, middle, long). In all cases, the profiles are smooth and well represented by a Gaussian.