[Left] Probability distribution function for n_α/n versus n_α/n, showing that the most probable value of n_α/n is ∼𝒪(10⁻²). Those alpha particles satisfying the condition β_∥α < 10⁻², which turns out to be susceptible to collisional relaxation, are treated separately, and their partial probability distribution function is plotted with blue dots. The opposite condition β_∥α > 10⁻² turns out to define the solar wind condition susceptible to instability relaxation, and these alpha particles are treated separately. Their partial probability distribution function is plotted with red dots. [Right] Probability distribution function for |V_p − V_α|/V_A versus the normalized proton-to-alpha relative drift speed, |V_p − V_α|/V_A, showing that the most probable value of |V_p − V_α|/V_A is also ∼𝒪(10⁻²).