  The branching of (k-1)-Schur functions into k-Schur functions was given by
Lapointe, Lam, Morse and Shimozono as chains in a poset on k-shapes. The
k-Schur functions are the parameterless case of a more general family of
symmetric functions over Q(t), conjectured to satisfy a k-branching formula
given by weights on the k-shape poset. A concept of a (co)charge on a k-tableau
was defined by Lapointe and Pinto. Although it is not manifestly positive, they
prove it is compatible with the k-shape poset for standard k-tableau and the
positivity follows. Morse introduced a manifestly positive notion of affine
(co)charge on k-tableaux and conjectured that it matches the statistic of
Lapointe-Pinto. Here we prove her conjecture and the positivity of k-(co)charge
for semi-standard tableaux follows.
