The oblique parameters in multi-Higgs-doublet models

We present general expressions for the oblique parameters S, T, U, V, W, and X   in the SU(2)×U(1)SU(2)×U(1) electroweak model with an arbitrary number of scalar SU(2)SU(2) doublets, with hypercharge ±1/2±1/2, and an arbitrary number of scalar SU(2)SU(2) singlets.