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Table 2.

Map shifts and core shifts.

Freq. pair Map shift Core shift

ΔRA ΔDec ΔRA ΔDec Δr
15–22 (a) 14 14 0 0 0
15–43 2 –167 24 –129 131
43–86 12 –95 6 –58 48
86–227 –6 17 –6 3 6

Notes. The values were derived using optically thin model components as a reference and are provided in μas.

(a)

For frequencies 15−22 GHz, there were an insufficient number of cross-identified components; hence, the core shift was assumed to be zero.

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