Example of a darkfield corrected MiHI frame of a spatially featureless solar scene, obtained by averaging a large number of frames recorded at many different positions near the center of the solar disk. The image contains 5120 × 3840 pixels, the inset, highlighting the area in the red box, shows the individual spectra, packed onto the detector. The spectral direction runs from the upper left to the lower right, at an angle of approximately 3°, the boundaries of an example region containing a single spectrum are indicated by the yellow dashed lines. Spectral features belonging to adjacent image elements are separated horizontally. The image has two clearly visible brightness levels, the right half appearing systematically darker than the left one, a consequence of the uncorrected nonuniform gain of the camera.