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We report on more than 1700 days of radio pulsar flux monitoring of a sample of 20 pulsars. Data were obtained on a nearly daily basis with an 85-ft telescope at the NRAO Green Bank site at an observing frequency of 610~MHz. Time series and structure functions have been analyzed for these observations. We will discuss the dependence of refractive modulation depth on scattering strength. This dependence can delineate between a Kolmogorov turbulence spectrum for the ISM inhomogeneities and other spectral models.
