Integrated flux spectrum for 3C 293 from our images and literature. The red crosses are the integrated flux densities measured within the 3σ contours in our images, where σ is the local RMS noise. For the LOFAR HBA point at 144 MHz, only Dutch array data was used. Black circles are values from Laing & Peacock (1980) (LP1980) and Kuehr et al. (1981) (K1981). Cyan, purple and green triangles are values from the Joshi et al. (2011), TGSS (Intema et al. 2017) and NVSS (Condon et al. 1998) respectively. Flux densities from TGSS and this project were set to the Baars et al. (1977) flux scale for consistency. The dashed line shows the straight line fit using the values from literature (including TGSS and NVSS) and has a slope of −0.64 ± 0.01.