Coalescence parameter ($B_{2}$) of antideuteronsin inelastic pp collisions at $\sqrt{s}$ = 7 TeV (circles) comparedwith the values measured at lower energies in pp , $\upgamma$p , ep (squares and hollow circles), and in p--Cu and p--Pb collisions (band at $p_{\text{T}}/A$ = 0 GeV/$c$).