Chiral splitting is the superholomorphic factorisation of integrands in superstring theory, derived several decades ago by D'Hoker and Phong. I will place this phenomenon in a modern context by expanding the chiral integrand of external graviton states in terms of the string tension. In doing so, the half integrand of the ambitwistor string will be shown to arise as a tensionless limit thereof. The possible implications for the duality between colour and kinematics will be discussed.
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