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Table 1

An overview of observational parameters of the five LOFAR-HBA observations used in this study.

Observation ID Start time [UTC]

L79324 06-Dec.-2012 22:41:05
L80273 12-Dec.-2012 22:17:30
L80508 16-Dec.-2012 22:01:46
L80897 21-Dec.-2012 22:42:46
L192832 15-Dec.-2013 23:06:40

Phase centre (J2000.0) 08h13m36.07s, + 48°13′02.58′′
Frequency range 115–189 MHz
Spectral resolution 3.2 kHz
Integration time 2 s
Observing time 8(6) h in 2012 (2013)

Notes. We are using in our analysis only 6 h, symmetric around transit, of each 8 h observation.

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