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Fig. A.1.

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Selected apertures. Left panel: Yellow lines indicate the apertures for the z ∼ 6.9 sources, while with cyan is used for the low-z objects, including the lens galaxy. For the W galaxy we use a dashed line to indicate that this aperture is not defined on the basis of the NIRSpec data, but from the 160 μm continuum ALMA image. Apertures for the subregions within the E galaxy are indicated with pink lines. The red region in this panel marks the region used to obtain the background spectrum. Right panel: Additional apertures, including the ones with 1 arcsec in diameter (i.e. E1c and W1c, in orange lines) used by Álvarez-Márquez et al. (2023). In this panel the red regions represent the spaxels used to probe the diffuse external emission outside the E and W galaxies (i.e. the Eext and Wext apertures).

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