Fig. 5.
Spectral evolution of the polarisation degree and the PA before MJD 58222 (panels a, b) and after MJD 58222 (panels c, d). Line styles in the order of increasing date: solid, dotted, dashed, dot-dashed, triple-dot-dashed, long-dashed. Both P and PA show almost flat spectral dependence in panels a and b. The weak dependence of both P and PA on the wavelength is visible in panels c and d.
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