Photometric extractions. Filled circles indicate the ratio between the observed photometry extracted in Kron apertures and that from modeling with CASA/IMFIT. Large arrows show the 2σ upper limits on aperture photometry. Small gray arrows are 3σ upper limits on Herschel/SPIRE from Sun et al. (2022). For reference, we show both the measured Band 6 flux densities in configuration C2 and the combined C2+C5 (offset to improve the readability). Left: Arc (z6.1-6.2). Center: z6.3. Right: Aperture photometry of both lensed images. The flux densities are normalized to that in Band 7 (122 μm rest frame) for clarity and to avoid introducing the uncertainties on the magnification factor. The measurements in Band 6 (158 μm rest frame) from Fujimoto et al. (2021) are shown as orange squares.