Fig. 3.
Improvement during self-calibration on extracted data. Left column: starting point of this process: a DI calibrated image. Middle column: results after DPPP TEC calibration, with all LOFAR core stations forced (“antenna constraint” solve) to have the same solution. Right column: final image after DPPP scalarcomplex gain calibration. Top row: 43–67 MHz LBA data. Bottom row: LOFAR international-baseline 120–168 MHz HBA data.
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