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System 5 low peak absolute errors. Absolute error (13) of X1 in (a) the mean for ETL (gradient 0.9) and xETL (gradient 0.06), MPTL (gradient 0.8) and xMPTL (gradient -0.3), TTTL (gradient 0.4) and xTTTL (gradient 0.0); (b) the second moment for ETL (gradient 0.9) and xETL (gradient -0.1), MPTL (gradient 0.8) and xMPTL (gradient -0.6), TTTL (gradient 0.3) and xTTTL (gradient 0.0). Results from 108 simulations, each run for T = 5.
