public object Clone()
{
var clone = new ErrorLimit();
if (MinusQuantity != null)
clone.MinusQuantity = MinusQuantity.Clone() as Quantity;
if (PlusQuantity != null)
clone.PlusQuantity = PlusQuantity.Clone() as Quantity;
if (Resolution != null)
clone.Resolution = Resolution.Clone() as Quantity;
if (Confidence != null)
clone.Confidence = Confidence.Clone() as Quantity;
return clone;
}