Fig. 1
A general Hα view of the field covered by our observations, obtained from our FORS1 observations in 2003. The objects discussed in the present study are marked. Th 28 is just outside the right edge of the frame, but its inner jet and the knots composing HH 228 can be identified. The field covers an area of 6′1 × 3′3, with north to the top and east to the left.
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