simulation.alpha([alpha])
If alpha is specified, sets the current alpha to the specified number in the range [0,1] and returns this simulation. If alpha is not specified, returns the current alpha value, which defaults to 1.
simulation.alpha([alpha])
If alpha is specified, sets the current alpha to the specified number in the range [0,1] and returns this simulation. If alpha is not specified, returns the current alpha value, which defaults to 1.
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