The absence of emission lines, together with the Balmer break, reveals that this is a temporarily or permanently (mini-)quenched, post-starburst galaxy. The clearly detected Ly α drop and the Balmer break unambiguously give a redshift of z = 7.3. The vertical dashed lines indicate the rest-frame wavelengths of the strongest nebular emission lines. The red line indicates the pPXF spectral fit. The upper panel shows the signal-to-noise ratio (S/N) in the 2D prism spectrum. The bottom panel shows the ratio between the residuals of the fit and the noise. For reference, the flux in the F200W NIRCam filter is 3.33 ± 0.08 × 10 −17 erg cm −2 s −1 , fully consistent with the spectrum.
