Left: test image with a grid pattern, corresponding to a Sun (with the limb shown in orange) with φobs = 0°, θobs = 5°, α = 0°, R⊙ = 500 pixels; axes are labelled in pixels. Right: the 45° × 45° central field of view (shown in green on the left image) projected to a Carrington coordinates grid with a pixel size δθ = δφ = 0.0277°.
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