Fig. 7
Image of Virgo A at 25 MHz. The map noise level is σ = 0.6 Jy/beam and the beam size is 85′′ × 44′′ (grey ellipse in the bottom-left corner). Positive contour levels are represented by black lines at (1, 2, 3, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20, 25, 30, 25, 40, 45, 50, 75, 100) × 5σ. Negative contour levels at −1σ are represented by a red dashed line.
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