Price above 4 EMA and now at 20 EMA

The following code performs exactly what you have requested but the results are not going to match the pattern you see on the chart. There is quite a bit more detail there then you described. But this is the code to do exactly what you specified:

input consecutiveBars = 6;
input percentThreshold = 2.0;
input maLengthOne = 4;
input maTypeOne = AverageType.EXPONENTIAL;
input maPriceOne = close;
input maLengthTwo = 9;
input maTypeTwo = AverageType.EXPONENTIAL;
input maPriceTwo = close;
input maLengthThree = 20;
input maTypeThree = AverageType.EXPONENTIAL;
input maPriceThree = close;
def maOne = MovingAverage(maTypeOne, maPriceOne, maLengthOne);
def maTwo = MovingAverage(maTypeTwo, maPriceTwo, maLengthTwo);
def maThree = MovingAverage(maTypeThree, maPriceThree, maLengthThree);
def stackedAverages = maOne > maTwo and maTwo > maThree;
def closeAbove = stackedAverages and close > maOne;
def countBarsAbove = Sum(closeAbove, consecutiveBars);
def withinPercent = close < maThree * (1 + percentThreshold * 0.01) and close > maThree * (1 - percentThreshold * 0.01);
plot scan = countBarsAbove >= consecutiveBars and withinPercent;