Observing configuration of the NCP field in LOFAR-EoR. The main target field NCP is located in the centre, and six flanking fields are distributed from the centre at an angular distance of 4° (indicated by circles of radius 4°). The bright radio source 3C61.1 is inside the RA 2h flanking field (SAP001). The image is constructed from a single observation night L612832 (~11.6-h duration) using full sub-bands. In this work, one night of data on the RA 18h field (blue circle) is analysed.