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Fig. 4.
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VLA K-band spectral stack, weighted by 1/σ2 and re-scaled to LFIR = 4.5 × 1012 L⊙ at z = 3 (mean of our sample, de-lensed). The dashed lines indicate the ±3σ confidence interval. No significant (≥3σ) detections are seen in the stacked spectrum.
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