CGPS H I emission distribution in velocity range from −46.0 to −67.4 km s⁻¹. Each panel is an average of three consecutive velocity channel maps, with the central Local Standard of Rest (LSR) velocity indicated in its top right corner. The colour bars show the brightness temperature in kelvin. The four H I shells are outlined in orange (1), magenta (2), yellow (3), and cyan (4). H II regions are marked with red circles (see Sect. 4).