//@version=3
study("Auto-Dispersion Bands",overlay=true)
length = input(90),smooth = input(140)
//----
band(src,mode)=>
x = change(src,length)
sq = sqrt(sma(x*x,length))
a = src + sq
b = src - sq
A = wma(wma(highest(a,length),length),smooth)
B = wma(wma(lowest(b,length),length),smooth)
band = mode == "Upper" ? A : mode == "Lower" ? B : na
//----
a = band(close,"Upper")
b = band(close,"Lower")
c = avg(a,b)
//----
plot(a,linewidth=2,transp=0),plot(c,color=orange,linewidth=2,transp=0),plot(b,linewidth=2,transp=0)
Could you convert this indicator into mt4? Thanks!