Fig. 1
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Multi-wavelength observations of Cas A. Upper panel: radio observation collected with the Very Large Array telescope in 1994 at the frequencies 1.4 GHz (L band), 5.0 GHz (C band) and 8.4 GHz (X band), which highlights the emission dominated by synchrotron radiation (Credit: L. Rudnick, T. Delaney, J. Keohane, B. Koralesky and T. Rector; NRAO/AUI/NSF). Lower panel: X-ray observation collected with Chandra in 2000, in sqrt scale, showing the emission in the [0.5, 2] keV (white) and [2, 7] keV (blue) bands.
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