Historical Volatility based Standard Deviation_V2

This Plots the Standard Deviation Price Band based on the Historical Volatility . SD             1, 2, 3.

Version update:
Fixed the Standard Deviation mistake on Version 1.
Added Smoothing Options for those who prefer a less choppy version.
Standard Deviation 3 plot is not set to Default
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//Created by UCSgears
//Plots Standard deviation on pricechart based on Historical Volatility. 
//This Code will be revised when Implied Volatility is available in trading view.

study(title="UCS_Standard Deviation-Historical Volatility_V2", shorttitle="UCS_StdDev(HV)", overlay = true)

length = input(10, minval=1)
DaystoExpire = input (30, minval=1) 
stddev1=input(true,title="Standard Deviation 1")
stddev2=input(true,title="Standard Deviation 2")
stddev3=input(false,title="Standard Deviation 3")
Smooth = input(true)
sm = input (21, title = "Smooth Length")

annual = 365
per = isintraday or isdaily and interval == 1 ? 1 : 7
hv = stdev(log(close / close[1]), length) * sqrt(annual / per)
stdhv = close*hv*sqrt(DaystoExpire/365) 
stdhv1 = Smooth ? sma(stdhv,sm) : stdhv
stdhv2 = stdhv1*2
stdhv3 = stdhv1*3

Stdhv1u = plot(stddev1 ? (close+stdhv1):na, color = red, title = "1st Standard Deviation Upperband")
Stdhv1d = plot(stddev1 ? (close-stdhv1):na, color = red, title = "1st Standard Deviation Lowerband")
Stdhv2u = plot(stddev2 ? (close+stdhv2):na, color = blue, title = "2nd Standard Deviation Upperband")
Stdhv2d = plot(stddev2 ? (close-stdhv2):na, color = blue, title = "2nd Standard Deviation Lowerband")
Stdhv3u = plot(stddev3 ? (close+stdhv3):na, color = black, title = "3rd Standard Deviation Upperband")
Stdhv3d = plot(stddev3 ? (close-stdhv3):na, color = black, title = "3rd Standard Deviation Lowerband")
Beautiful Work!!!

I had it on my list to code this...It's always nice when someone does it for you...
Can anyone discuss the settings for this indicator? Length, width and smoothness and what those are?
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