Central region of the deep LOFAR-HBA maps of the Lockman Hole field generated at 150 MHz. The color scale is the same on all panels and is displayed using an inverse hyperbolic sine function to render both the low level artifacts and some bright sources. The stripy artifact seen in the zoom-out in panel b seems to be produced by the residual deconvolution and calibration errors of a few ≳ 10 mJy beam⁻¹ bright sources that are a few degrees away from the center of the field. (a) The central ≳ 2 deg² part of the Lockman Hole field as imaged by Alg. 2. (Sect. 4.2). (b) Zoom in on region (1) of the map shown in Fig. 13a. (c) Zoom-in on region (2) of the map shown in Fig. 13a.