public class Series
{
      // Methods
      public Series();
      public virtual double Accept(int index, Indicator indicator);
      public double GetHigh(int index, int period);
      public double GetLow(int index, int period);

      // Properties
      public int Count { get; }
      public double High { get; }
      public double this[int index] { get; set; }
      public double Low { get; }

}