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We first demonstrate how duality for the fibres of the so-called Hitchin fibration works for the Langlands dual groups Sp(2 m ) and SO(2 m  + 1). We then show that duality for  G  2  is implemented by an involution on the base space which takes one fibre to its dual. A formula for the natural cubic form is given and shown to be invariant under the involution.

LANGLANDS DUALITY AND G 2 SPECTRAL CURVES