Extrapolated 150 MHz flux densities vs the LBCS signal-to-noise statistic n_S. Top: signal-to-noise bin n_S (with the adopted scaling of ≤132 mJy for n_S =0 to ≥370 mJy for n_S =9) vs flux for LBCS sources in the VLBA calibrator list. Blue lines (for n_S < 9) and points (n_S = 9) represent stations close to the Exloo core: DE601/Effelsberg, DE605/Jülich and DE609/Norderstedt; green for somewhat more distant stations: DE603/Tautenberg, DE604/Potsdam; yellow for more distant stations DE602/Unterweilenbach, FR606/Nançay, SE608/Onsala, UK608/Chilbolton, PL610/Borowiec. The red lines represent the furthest stations (PL611/Łazy, PL612/Baldy, IE613/Birr) and are noisy due to the small number of observations. For these stations, the points for n_S = 9 (not shown)are above the top of the plot. Bottom: as above, but for all sources, not just those in the VLBA calibrator list. The black line is the level registered by observations of blank sky, for which the signal-to-noise statistic saturates.