Astronomy & Astrophysics

Table 1: Comparison among the results found at different frequencies with different methods on the main radio periodicity of $\sim$ 8 years.
Method 4.8 GHz 8.0 GHz 14.5 GHz 22 GHz 37 GHz

DFT (days) 2984 2991 3035 3180 3154

ACF (days) 2843, 5718/2 2720, 5718/2 2801, 5803/2 2968, 5924/2 2799, 5760/2

SF (days) 2839, 5689/2

Mean (years) 7.87 7.82 7.97 8.31 8.06

**Table 1:** Comparison among the results found at different frequencies with different methods on the main radio periodicity of $\sim$ 8 years.
Method	4.8 GHz	8.0 GHz	14.5 GHz	22 GHz	37 GHz
DFT (days)	2984	2991	3035	3180	3154
ACF (days)	2843, 5718/2	2720, 5718/2	2801, 5803/2	2968, 5924/2	2799, 5760/2
SF (days)	2839, 5689/2
Mean (years)	7.87	7.82	7.97	8.31	8.06

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