Optical counterparts of the three gravitationally lensed quasars with the 144 MHz LoTSS contours overlaid. The contours shown are at the 3σ, 4σ, 5σ, 6σ, and 7σ level, where σ is the off-source rms noise (given in Table 2). For SDSS J1055+4826 and SDSS J1313+5151, we show the SDSS g-band images. For SBS 1520+350, we show the HST V band (F555W filter). For SBS 1520+350, the quasar images are indicated with the red circles, and the primary and secondary lensing galaxies are denoted with the green circles; the unlabelled objects are foreground stars.
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