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Table 2:

Observation strategy 2006/07.
  Sig Ref. Spacing

A B 5$^\prime$
2 B C 15$^\prime$
3 C D 10$^\prime$
4 D A 30$^\prime$

Notes. Every weekend we observed four positions, A-D, in a sequence using $\sim $10 h towards each position with one frequency setting (also shown in Fig. 1).

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