Where does the "knot" is put in the neck during judicial hanging?

In judicial hanging, a rope to allow a drop of five to seven metres according to the weight, build and age of the person, is looped round the neck, with the knot under the angle of the jaw. This causes fracture-dislocation usually at the level of the second and third, or third and fouh cervical veebrae. Ref: The essentials of forensic medicine and toxicology by Dr K S Narayan Reddy, 27th edition, Page 306.