342 Chapter 11. Magnetic helicity interpreted and Woltjer-Taylor relaxation(a) (b) (c)(d) (e) (f)Figure 11.3: (a) Two linked, untwistedflux tube squeezed to be ribbons, magnetic field
directions shown by arrows;(b) cut at overlay of two ribbons;(c) reconnection at cut;(d)
deformation;(e) more deformation;(f) more deformation showing there are two complete
twists of magnetic field.