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. Fig, 1 and ? b = 0: For log 10 ? = ?6.0 (fig. (a)), log 10 ? = ?7.5 (fig. (b)) and log 10 ? = ?4.6 (fig. (c)), graphs of the random normalized energy density f ? H n dB (2?f ) Mean system (thin solid line) Mean value for the stochastic system (thick solid line) Confidence region (grey region)