Example of the Source Extraction Code (SEC) on unCLEANed and CLEANed data sub-cubes. Left: example peak intensity map of a dirty sub-cube towards l = 26.5270 deg, b = –0.2674 deg which is an example of the data used when making preliminary detection catalogues with our SEC. Velocities of known sources are shown in red text, while pink squares highlight the final source detections. In this “dirty” image, the bottom two sources would not have been detected. Right: once we CLEAN the image, we can see how the two bottom sources would indeed be detected by our SEC and, as such, illustrates how running the SEC again on the cleaned sub-cubes can lead to new detections.