Comparative review of the ionization yield Y(ϵ), Y U p ( ϵ ) , and Y U p , I st ( ϵ ) for Xe atom as a function of ellipticity ϵ(0,1), when the laser intensity: (a) is fixed to the value I=1.1 × 10¹⁴ W/cm², and (b) varies within the range I=0.8 × 10¹⁴ W/cm²–3.0 × 10¹⁴ W/cm².