Figure 5.12: Maps of the stars in the Orion region. The centre of each map is at
α = 83.1, δ = −2.8 degrees, the scales are in radians, the field size is 22 degrees
square. The map on the left shows all stars for proper-motion features A and B
together, the map on the right shows all stars for proper-motion feature A. Notselected stars are shown light grey.