Comparative review of the ionization yield as a function of ellipticity ϵ(0,1) of: (a) Y(ϵ), (b) Y U p ( ϵ ) , and (c) Y U p , I st ( ϵ ) , when the laser intensity is fixed to the value: I=3 × 10¹⁴ W/cm². The following notation is used for all the three panels: solid line is for Xe atom, dashed line is for Kr atom, and dotted line is for Ar atom.