Fig. 3
GMRT 153 MHz contours of the central emission in A 1682, starting at ±3σ153 MHz = ±5.1 mJy/b and spaced by a factor of two. The resolution is 29.5′′ × 18.0′′, PA 53.8°. Contours are overlaid on the 240 MHz image, shown in greyscale, at a resolution of 18.3′′ × 14.0′′, PA 21.7° (Venturi et al. 2009). The lowest level of the greyscale corresponds to 3σ240 MHz = 0.75 mJy/b.
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