We introduce a novel methodology to distinguish planetary migration mechanisms by a combination of Rossiter-McLaughlin measurements and direct imaging observations. The methodology is especially useful to specify a planetary migration mechanism one-by-one for an eccentric or tilted planet. We present an example of the application of the methodology for HAT-P-7 based on our observation... https://parisnaturalfoodes.shop/product-category/gf-liquid-iron-w-vitami/