Flux densities of the two Gaussian components that can be fitted to the e-MERLIN visibilities of J1530+1049. Circles and squares are for components N and S, respectively. The solid and dashed lines are power-law fits to the corresponding data points. For comparison, the sum of the flux densities of the EVN-detected components is also shown with an upward yellow triangle. Empty downward brown triangles show lower-resolution flux density measurements from various surveys (see Sect. 4.4 for details), and the brown line indicates the power-law fit to those points. The numbers show the corresponding spectral indices.