SEBA Script DEMA 1

study(title="Double Exponential Moving Average", shorttitle="DEMA", overlay=true)
length = input(12, minval=1)
e1 = ema(close, length)
e2 = ema(e1, length)
dema12 = 2 * e1 - e2
plot(dema12, color=red)

length_2 = input(26, minval=1)
e1_2 = ema(close, length_2)
e2_2 = ema(e1_2, length_2)
dema26 = 2 * e1_2 - e2_2
plot(dema26, color=blue)