Fig. 8.
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Spectra and plots of velocity drift. Left panel: spectra of the main maser component M1 in (a) epoch 2018.16 and in (b) epoch 2018.83, with the Gaussian fit (thin red line) used to estimate the velocity drift. Right panel: velocity–epoch diagram. Here, we show the positions in velocity of M1 observed in the two VLBA epochs with the corresponding error bar derived by the Gaussian fit.
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