// Setup PRZs
if (charac == null)
throw new NullPointerException("charact == null");
radialCharac =
new PhotonRadialDistributionListener(charac, center, normal,
rmax, channels, true);
radialTotal =
new PhotonRadialDistributionListener(charac, center, normal,
rmax, channels, true);
charac.addXRayListener(radialCharac);
charac.addXRayListener(radialTotal);
if (characFluo != null)