The distributions of tunneling time and tunneling exit of photoelectron trajectories. In panel (a), the ionization time t_r are shown by scatter points. The electric components of light fields, E z ( t ) and E x ( t ) , are shown by solid lines, whose gradient colors indicate the time evolution. In panel (b), distribution of tunneling exits and the spatial profile of laser fields are presented. The gradient colors in panels (a) and (b) are mapped to the same time.