Overall rms distribution of LoTSS-DR2 shown in the light blue histogram (y-axis on the left). The contributions from the RA-13 and RA-1 regions are shown by the darker blue histograms with \ and / hatchings respectively. The rms distributions of the two regions are approximately equal above 0.1 mJy beam⁻¹ but otherwise the RA-13 region is on average higher declination and therefore generally more sensitive than the RA-1 region. The median and mean of the rms are 83 μJy beam⁻¹ and 95 μJy beam⁻¹ over the entire LoTSS-DR2 region where 90% and 95% is below 140 and 170 μJy beam⁻¹ respectively. The solid red line shows the cumulative area of the entire LoTSS-DR2 region with an rms noise below a given value with the dashed and dashdot lines showing the same but for the RA-13 and RA-1 regions (y-axis on the right).