[en] Stratification of emission is observed in two adiabatic supernova remnants, the Cygnus Loop and G 65.2+5.7. Regions most intense in the [O 3] 5007 A line are situated by 0.04-0.6 pc closer to nebula borders than the ones most intense in [N 2] 6584 A and [S 2] 6717+31 A. The stratification can be explained in terms of the double-component model of supernova remnants: the main shock wave makes a radial deployment of the line formation zones formed behind the inner shock wave in a cloud. The deployment scale depends on the shock wave velocity and the line formation time. The theoretical values agree well with the observed distances between the O⁺⁺, N⁺ and S⁺ radiation regions