Plot[Piecewise[{{-(0.8 + (1.0 - 0.8) * tanh((-x-0.8)/(1-0.8))), x <= -0.8}, {x, -0.8 < x < 0.8}, {0.8 + (1.0 - 0.8) * tanh((x-0.8)/(1-0.8)), x >= 0.8}}], {x, -3, 3}]

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