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Fig. 4

image

Inferred spectrum of the planet with a contrast 5 × 10−6 injected into the synthetic HARMONI data (see Fig. 3 with spectral unmixing through orthogonal subspace projection (dark blue), compared with the high-frequency component of the injected spectrum (orange) along with the difference between the two (black). The first-overtone bandheads of CO are highlighted as being well recovered (shade). The unmixing is not perfect, and the spectrum of the planet is contaminated with residuals from the subtraction of the diffracted starlight (bottom).

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