Total cross correlation S/N (peak divided by standard deviation) obtained from emission spectra of exoplanet HD 189733 b processed without removing spectrum of parent star (top panel, analogous to de Kok et al. 2013), and by removinga spatial and temporal average of the 3D simulation detailed in Sect. 5.1 (bottom panel). A clear detection of the planet, marked with white dashed lines, appears in the latter case.
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