Proper motion study of the 6.7 GHz methanol maser rings - I. A sample of sources with little variation

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Fig. 6

Histograms of separations between SE and NW maser spot pairs in each epoch and the separation increase between epochs E2 and E3 relative to E1 in G23.207−00.377. The dashed lines mark the mean histogram values, while the dotted lines mark the median values. The histograms for the remaining targets are presented in Fig. A.7.

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