Top row: example 4.5°×4.5° mosaic image centered on the TGSS pointing R23D74 as found in ADR1 (left; 3.6 mJy beam-1 noise for a 25′′×25′′ beam), and the corresponding area in the frequency-averaged LOFAR HBA MSSS verification field (MVF right; 6.4 mJy beam-1 noise for a 108′′×108′′ beam). Both images are displayed using the same color scale. Bottom row: a 2°×2° zoomed-in version of the top row images, showing more detail. The ADR1 and MVF images are quite complementary, with the MVF image demonstrating good low surface brightness sensitivity, while the TGSS image demonstrates its resolving power and lack of sidelobe structure near the brightest sources. The black circle marks the location of a double source with low surface brightness, illustrating the difference in detectability of such sources in the two surveys.
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