Spectral index distribution. Left: source WDDGGHK 10 with 325 MHz contours of 0.5, 0.7, and 0.9 mJy beam⁻¹. Center: sources WDDGGHK 7, 8, and 9, and GMRT 1, with 325 MHz contours of 0.5, 1, and 2 mJy beam⁻¹. Right: source WDDGGHK 6 with 325 MHz contours of 0.5, 1, and 2 mJy beam⁻¹. Since the error of the spectral index is largest at the edges of the sources because the emission is weaker, extreme values of the spectral index can be generated in those areas.