Fig. 4.
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Spectral index maps of the isolated M87 infrared jet between the short and long wavelength images, respectively (top and bottom panels). The index α is defined as Sλ ∝ λα (∝ ν−α). Floors of 0.5% (top panel) and 1.5% (bottom panel) of the image maxima were applied prior to calculating the spectral index. The images have the same spatial scale.
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