What do all the colours of the shapes on the images mean?

There are 3 types of shapes drawn into the optical images:

1. Green solid contour lines which indicate levels of radio brightness.
2. Blue solid ellipses which indicate MeerKAT sources with high radio signal strength. These regions were identified by a program called AEGEAN.
3. Green dotted ellipses which indicate MeerKAT sources with lower radio signal strength.

#How do I distinguish between a radio point and a radio extended source?#

1. The rule of thumb is to pick radio point source if the radio contours are round-ish and contained inside the blue ellipse.
2. If the radio contour extends beyond the blue ellipse (even if it is round-ish), or has a weird shape (very elliptical or blob-like for example) or bumps, it should be considered a radio extended source.

#Will the optical counterpart be considered as anything inside the blue ellipse?#

1. No, the optical counterpart, if it exists, will be close to the centre of the blue ellipse.
2. If there are multiple optical point sources inside the ellipse but none of them are centered on the blue ellipse, the radio source likely does not have an optical source in this data.