  The computer animation illustrates the geometries described in a paper by the
same authors. The preprint is available as number 9401045. The opening scene
shows dipole field lines emanating from the polar caps of a rotating neutron
star. The dipole axis is inclined along the green rods. The field lines shown
are defined from the condition that they be tangent to the light cylinder (the
cylindrical radius at which the tangential velocity of rotation reaches the
speed of light). The static dipole field lines are smoothly morphed into the
correct retarted-potential vacuum solutions. A red surface spanning these field
lines is painted. In the next scene the blue surfaces represent the outer gaps
above the surface of last closed field lines. High energy emission (blue) is
produced in these outer gaps, and is beamed tangentially along the field lines.
The radio emission (green) originates close to the surface of the star and is
beamed along the dipole axes. The inclination angle $\alpha$ of the dipole and
the viewing angle $\zeta$ are chosen to match the Crab parameters; $\alpha$ =
70, $\zeta$ = 65. The corresponding light curve is computed and shown for these
angles, and the red dot traces rotation phase. The next scene shows the
situation for angles appropriate to PSR1706-44; $\alpha$ = 45, $\zeta$ = 65.
The final scene is a possibility for Geminga; $\alpha$ = 20, $\zeta$ = 75.
These angles are poorly constrained as there is no radio emission.
