Intra-pulse evolution of modulation index. Top: Channelized pulse intensity averaged over frequency. Bottom: Colored triangles represent the modulation index of the spectrum at each time bin, with each color corresponding to results from a system with different RP values. The solid lines represent the modulation index measurements from the pulse averaged spectrum of these systems. The channelization provides sufficient frequency resolution to resolve all the MW’s scintillation. RP < 1 when the screens do not resolve each other and RP > 1 when screens resolve each other.