Composite images of the shock structure around λ Cephei. The star is at the central position, marked by a magenta cross; north is up, east is left. The size of both plotted fields is 20′ × 20′. Left: WISE W3 band (12 μm, red), WISE W4 band (22 μm, green), IPHAS Hα (blue); centre: MIPS 24 μm (greyscale), IPHAS Hα (magenta). Right: composite image of the simulated shock structure, rotated about the z-axis by 25°, and the image from the centre panel. The simulation image was further rotated by 90° + 31.373° anticlockwise to align the BS directions.