Distribution of the median rms noise within 3° of the pointing centre for the primary-beam-corrected V-LoTSS images. The group of fields centred around an RA of 13 h are shown in blue, while the fields centred around an RA of 0h are shown in yellow. The distribution of all fields is shown in black. The median rms noise for all the fields is plotted as a dashed red line at 140 µJy beam⁻¹.