The WMAP7 parameter constraints for the μ annihilation channel. Along with two annihilation parameters log ₁₀(m_DM) and  ⟨ σ_Aυ ⟩ /m_DM, we also show the constraints on the other 6-parameter ΛCDM background model: Ω_Bh², Ω_DMh², H₀, τ, n_S, log ₁₀(A_S). From the inside out the colored 2D areas show the 1-sigma and 2-sigma regions after marginalization over the other parameters, and the dashed lines show the same regions for the basic 6-parameter ΛCDM without annihilating DM. The topmost panels in each column plot the marginalized 1D probability distributions for all of the parameters.