public override void Calculate(int index)
{
var idx = index + Instrument.IdxFirst;
var mcs = Instrument.EMATrueRange(idx - Periods, idx);
var extrp = MA.Extrapolate(1, Periods, idx_: idx);
var slope = extrp != null ? ((Monic)extrp.Curve).A : MA.FirstDerivative(idx);
var ma = MA[idx];
MA0[index] = ma;
Top[index] = ma + Distance * mcs + SlopeWeight * slope;
Bot[index] = ma - Distance * mcs + SlopeWeight * slope;
}