NGC 4625. The first row shows from left to right the 144-MHz maps at 6 and 20 arcsec resolution, respectively. Contours start at 3σ with with increments of a power of two. The black circle shows the optical D₂₅ diameter and the blue ellipses show the 3σ contour extent used to integrate the flux density. The second row shows again the 6 and 20-arcsec images without contours. The third row shows the 6- and 20-arcsec contours overlayed on an rgb SDSS image. The filled circle in the bottom-left corner shows the synthesised beam. A scale bar shows the projected size at the distance of the galaxy.