VLBA-VLA flux density ratio. The blue dots represent upper limits for the VLA sources from the input catalogue. Their VLBA-VLA flux density ratios have been computed as 5.5 × rms_VLBA/S_VLA, where rms_VLBA is the rms noise of the VLBA naturally-weighted image (since we used the natural weighting for source detection), and S_VLA is the integrated VLA flux density of the source. The red dots with error bars represent the VLBA detected sources.