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Notes: 1) The slope is defined as the difference between the 'ideal gain' at the start frequency and the 'ideal gain' at the stop frequency. 2) The gain flatness is the deviation of any amplitude value from the ideal gain curve calculated by the following mathematical model: Gain = G + C'SQRT(fx/fi). G = constant gain (frequency independent); C = cable constant; fx = desired frequency; f, = start frequency. The cable constant C must be optimized during the flatness determination so that the curve best fits the measured gain figures. The start value for C is calculated using the formula Cstar, = (Gn-Gi)/(SQRT(fn/fi)-l), where Gn = the measured gain at the stop frequency, Gi = the measured gain at the start frequency and fn = stop frequency. The value of G is chosen so that the max. positive deviation of the measured gain from the 'ideal gain' curve is the same as the max. negative deviation. The value of C is adapted by + 0.001 until the 'ideal gain' curve best fits the measured curve. The flatness of the module gain is the maximum deviation in measured gain from the optimized gain formula.