Radiative kaon decays and the penguin contribution to the ΔI=1/2 rule

A consistent census of penguins in the ΔI=1/2 rule is taken from the η0 pole contribution to the radiative KL→γγ, KS→π0γγ and K+→π+γγ decay modes. We briefly comment on its impact for KL→π0π0γγ, KL→π+π−γ and check its compatibility with the KL−KS mass difference and the CP violating ɛ′/ɛ parameter.