For if we pass an iteration band in the direction of the field lines (and away from the cycle), the iteration number k is increased by 1 and the number ψ is increased by β, therefore the number is constant along the field line.
For if we pass an iteration band in the direction of the field lines (and away from the cycle), the iteration number k is increase?d by 1 and the number ψ is increased by β, therefore the numb,er is co,nstant along the field line.