Notes. The statistical result is discussed in Sect. 4.5. Columns 1–3 list the basic information of the sample, from which we calculate [N₁, N₂, N₃] with three different methods. N₁ is our result, while N₂ and N₃ are for comparison. All three methods use Eq. (7) to obtain σ(m_p)/m_p, but different Ξ values. For N₁, the Ξ is calculated from Eq. (10), while we set the Φ₄(P, e, i) = 1 when we calculate the Ξ for N₂. For N₃, we use Eq. (9) to get the Ξ, and thus the binary period and the observation time are limited within 5 yr.