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# Long description

The figure illustrates an all-sky map of the CMB radiation, as mapped by ESA’s Planck mission. In the figure, an ellipse is shown. The ellipse is filled with dots in various shades of blue and orange. Below the ellipse, a horizontal bar labelled ‘Delta T divided by the Greek symbol mu K’ is shown. The left end of the bar is labelled ‘negative 300’, and the right end of the bar is labelled ‘300’. A colour gradient on the bar transitions from left to right as follows: dark blue to white, and then white to red.