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Responses at a well producing a composite system under subdiffusive flow. All solutions generated through equation (36) for of illustrate derivative responses, . The influences of , and the exponent, , are considered; the properties of Zone are held constant. The two dashed lines marked AN reflect calculations obtained through equation (59) and are in excellent agreement with the rigorous solutions which meet the two stipulations (equal ’s and ’s) stated. The upward rise in the responses as the magnitude of the exponent decreases reflects the lower effective permeability of Zone 2.