Eigenmode of (15)–(16) under a prescribed converging flow , satisfying (∂_zB_R,∂_zB_φ) = 0 at z/h = 0, B_R = 0 at z/h = 2, and ∫B_φ dz = 0. This solution includes a Keplerian radial shear rate  d log Ω/ d log R = −3/2, an Ohmic resistivity η = 0.1Ωh², and the dynamo coefficients estimated in the reference simulation M3T10R10: , , , and . It is marginally unstable with a growth rate of 5.3 × 10⁻⁴Ω.