The spacing between members need only be equal. IN is called once all members are lined up at ^10. The distance of the horizontal pass is not defined. The first cut up is 45°. At ^30 the second cut is made and travels for a distance of 50%. Execute a 90° cut down to an altitude where the bottom tip of the kite is at ^2. Cut up to ^50 and arc around to ^30. Once you have crossed the same point for the third time call OUT. That point should be at the centre of each individual kite's window.
NB A diagram of T-15 was not given in the original STACK/AKA rulebook and it is unclear whether this diagram is exactly what the designer had in mind. It should NOT be used as a compulsory figure in competitions!