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Fig. 4.

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Quadrupole-octopole alignment in the cleaned Planck PR4 CMB temperature maps. In the upper panel, we show the distribution of SO (see Eq. (6)), indicating the planarity of the octopole is. Higher values are obtained for 59 SEVEM simulations (out of 600) and 9 (out of 100) for Commander. In the lower panel, we show the distribution of SQO, measuring the alignment between quadrupole and octopole. Only one simulation in both sets has a higher SQO value than the observed data. The solid orange and dashed blue lines correspond to the SEVEM and Commander maps, respectively.

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