Exponential Moving Average Convergence/Divergence

study(title="Exponential Moving Average Convergence/Divergence", shorttitle="EMACD")
source = close
fastLength = input(12, minval=1), slowLength=input(26,minval=1)
signalLength=input(9,minval=1)
fastEMA = ema(source, fastLength)
slowEMA = ema(source, slowLength)
macd = fastEMA - slowEMA
signal = ema(macd, signalLength)
hist = macd - signal
plot(macd, color=blue)
plot(signal, color=orange)