Region of the LOFAR LBA sky survey re-imaged using direction-dependent calibration (rms noise: 1.3 mJy beam−1 - beam: 15″ × 15″). Top right: same field without direction-dependent calibration (as presented in this paper; rms noise: 3 mJy beam−1 – beam: 46″ × 32″). Green and blue regions show the location of the identified sources as described in 13. Bottom right: same field in the VLSSr survey (rms noise: 73 mJy beam−1 - beam: 80″ × 80″).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.