Intraday-Std-indicator

CODE:
using System;
using WealthLab.Backtest;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Collections.Generic;
using Humanizer;

namespace WealthScript2 
{
    public class MyStrategy : UserStrategyBase
    {
      TimeSeries _rSD; 
      
        public override void Initialize(BarHistory bars)
        {
         if (!bars.IsIntraday)
         {
            DrawHeaderText("Intraday Bars Required", WLColor.Fuchsia, 14);
            return;
         }
         _rSD = new TimeSeries(bars.DateTimes, true);
         
         int firstBar = 0;
         for (int bar = 1; bar < bars.Count; bar++)
         {
            if (bars.IsFirstBarOfDay(bar))
            {
               firstBar = bar;
               continue; 
            }

            int n = bar - firstBar;
            if (n > 1)
            { 
               _rSD[bar] = StdDev.Value(bar, bars.Close, n);               
            }
         }

         PlotTimeSeries(_rSD, "Resetting SD", "rSD");
        }

      public override void Execute(BarHistory bars, int idx)
      { }
    }
}