Accuracy of ray tracing in a magnetic field.
Associated notes are:
How the program tries to achieve the requested inaccuracy.
Accuracy for relativistic motion.
Trouble-shooting for rays.
Nearly helical motion in a strong magnetic field
With a long step length or time the output ray information might be 'sampled' at points spaced by one or more turns, giving a distorted plot of the ray and also invalidating the interpolation information (but do not be mislead by this, since the non-interpolated output information is still correct).
Return to general note on accuracy of ray tracing.