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Fig. 5.

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X-ray-to-optical polarization degree ratio (ΠXO) of the six HSP blazars observed by IXPE plotted against their X-ray polarization degree (ΠX). In the case of PKS 2155−304, the two time bins (T1 and T2) are presented separately (see Sect. 2.5), while for the others the detected (> 99.7% confidence) values are averaged over the IXPE pointing.

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