Evolution of the position of the source 2101+600 in the sky plane over the period from 2017.0 to 2021.2. The R.A. and decl. time series (Figure 7) were fitted by the linear trend and harmonic signal with the period of 3 yr. This approximation is shown by the black curve. The estimates of the amplitude of variations are 0.28 ± 0.05 mas in R.A. and 0.11 ± 0.05 mas in decl.. The reference point corresponds to the solution aus2020a. crf. The error bars are from Figure 7, but referred to the fitting curve here.