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Compute the tilts only if raman-flag in sim_params is turned on. Use actual input power in fiber (according to expected propagation during design). Creates a function that computes the expected tilt after propagation in a span, and returns the normalized power difference at the center frequency of each band, and the tilt experenced between lower and upper frequency in each band. Include the expected tilt when computing target gains of amplifiers. Current function requires that the bands remain in the same order. (ordering is ensured when creating the objects). Change-Id: I28bdf13f2010153175e8b6d199fd8eea15d7b292