Sensitivity of the LoTSS-DR3 mosaics as a function of declination. The blue points and line show the median sensitivity as a function of declination in 5° strips. The orange curve shows the sky area covered by our mosaics in each declination strip. The grey shading shows the 95%, 90%, 85% etc sensitivity level for the noise pixels in each declination range. The inset shows the distribution of noise in the entirety of LoTSS-DR3 and the median noise level of 92 μJy beam⁻¹ is marked in blue.