The electron loss to the continuum (ELC) process was investigated in ${\mathrm{He}}^{+\mathrm{\ensuremath{-}}}$(He,Ar) collisions at 1.41- and 2.41-a.u. impact velocities. The cusp-shaped energy distributions of electrons ejected into the forward direction were measured in coincidence with the scattered ${\mathrm{He}}^{2+}$ projectile ions. The shape of these cusps was studied by fitting the multipole series expansion [Meckbach, Nemirovsky, and Garibotti, Phys. Rev. A 24, 1793 (1981)] of the measured spectra using ${\mathit{B}}_{\mathit{n}\mathit{j}}$, the nth-order expansion coefficients of the jth-order Legendre polynomials, as fitting parameters. The observed skewness of the spectra (nonzero ${\mathrm{\ensuremath{\beta}}}_{1}$=${\mathit{B}}_{01}$/${\mathit{B}}_{00}$ values) indicates the importance of the higher-order theories in the description of the distribution of ELC electrons. A dip at the top of the peak (``cusp inversion''), reflected by a positive ${\mathrm{\ensuremath{\beta}}}_{2}$=${\mathit{B}}_{02}$/${\mathit{B}}_{00}$ value, was observed in the 1.41-a.u. ${\mathrm{He}}^{+\mathrm{\ensuremath{-}}}$He collision.