Form factor in K+→π+π0γ:: Interference versus direct emission

We analyze the effect of a form factor in the magnetic contribution to K+->pi(+)pi(0)gamma. We emphasize how this can show up experimentally; in particular, we try to explore the difference between a possible interference contribution and a form factor in the magnetic part. The form factor used for K+->pi(+)pi(0)gamma is analogous to the one for K-L ->pi(+)pi(-)gamma, experimentally well established.