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Table C.3.

Generalised Lomb-Scargle test results of the optical light curves of PKS 2131–021.

Test Description Data GLS period (days) GLS power p-value
1 Independent of radio data CTRS+ZTF 1711 0.22 0.937
2 Prior knowledge of radio period CTRS+ZTF 0.047
3 Prior knowledge of radio period ZTF 0.065
4 Prior knowledge of radio period CRTS 0.079

Notes. The GLS peak in the OVRO 15 GHz light curve has power 𝒫peak  =  0.83, and p-value = 5.3 × 10−5 (K25).

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