Constraints on the viewing angle and obliquity. For symmetry reasons, the other three quadrants are not shown. Colours indicate the value of the peak separation, Δ, from 0.41 in violet to 0.49 in red. The white circle, square, and triangle show the location of three possible fits to the γ-ray peak separation with (α, ζ) respectively as (71° ,71° ), (51° ,82° ), and (24° ,87° ). The green area highlights the region in the diagram where γ-ray emission is detected simultaneously with the radio pulse for (α, ζ) = (71° ,71° ). The other dashed and dotted line delimit the same region but for (α, ζ) = (51° ,82° ) and (α, ζ) = (24° ,87° ), respectively.