Left panel: a close-up view of the H2O maser features around NGC 7538-IRS1. Right panel: a zoom-in view of the boxed region of the left panel. The octagonal symbols are the identified maser features in the present work scaled logarithmically according to their peak flux density. The maser LSR radial velocity is indicated by color. A 10 Jy beam-1 symbol is plotted for illustration in both panels. The reference position is and δ2000 = + 61°28′10′′.428, which was estimated as described in Sect. 3. The linear polarization vectors, scaled logarithmically according to polarization fraction P1 (in Table 1), are overplotted. The dashed line (PA = –52°) is the result of the best linear fit of the H2O masers of group N (features W16 and W17 were not included).The synthesized beam is 1.0 mas × 0.4 mas.
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