VWAP Bands [LazyBear]

//
// @author LazyBear
// List of all my indicators:
// https://docs.google.com/document/d/15AGCufJZ8CIUvwFJ9W-IKns88gkWOKBCvByMEvm5MLo/edit?usp=sharing
//
study("VWAP Bands", overlay=true)
l1=input(1.0, title="VWAP 1 Multiplier")
l2=input(2.0, title="VWAP 1 Multiplier")
src=close
b=vwap(src)
length=input(34)
plot(b, color=gray, linewidth=2)
plot(b+l1*stdev(src, length), linewidth=2, color=red, style=linebr)
plot(b+l2*stdev(src, length), linewidth=2, color=red, style=linebr)
plot(b-l1*stdev(src, length), linewidth=2, color=green, style=linebr)
plot(b-l2*stdev(src, length), linewidth=2, color=green, style=linebr)

// Uncomment the lines below if you need 3rd VWAP band
//
//l3=input(2.5, title="VWAP 3 Multiplier")
//plot(b+l3*stdev(src, length))
//plot(b-l3*stdev(src, length))