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Decomposition of \( S_{4}^{\mathrm{new}}(8) \) into irreducible Hecke orbits

magma: S := CuspForms(8,4);
magma: N := Newforms(S);
sage: N = Newforms(8,4,names="a")
Label Dimension Field $q$-expansion of eigenform
8.4.1.a 1 \(\Q\) \(q \) \(\mathstrut-\) \(4q^{3} \) \(\mathstrut-\) \(2q^{5} \) \(\mathstrut+\) \(24q^{7} \) \(\mathstrut-\) \(11q^{9} \) \(\mathstrut+O(q^{10}) \)