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Fig. 1

image

Mars Express Phobos fly-by experiment field on the sky. A large black star denotes the field centre; three crosses denote the pointings used in the experiment ET027 to observe possible secondary calibrators; five smaller black stars denote the detected sources; the circle represents the approximate size of the primary beam of a 30 m antenna. The colour insets show calibrated images of three of the sources in the field obtained in the ET027 experiment.

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