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Published online by Cambridge University Press: 08 February 2017
We used GONG time series for ℓ = 0,1,2,3 from June 10, 1995 to January 7, 1997, 578 days in total. The duty cycle varies significantly during this period of time but on average it is sufficiently high, and the remaining gaps are irregular. Because of this we do not see daily side lobes in the spectra obtained.