Accumulated total spread per candle

During volatile market conditions brokers tend to increase spread.

int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
  {
   int spread_array[];
   ArraySetAsSeries(spread_array,true);
   int spreads_count=CopySpread(_Symbol,_Period,0,rates_total,spread_array);
   for(int i=0;i<spreads_count && !IsStopped();i++)
     {
      Spread_Buffer[rates_total-1-i]=spread_array[i];
     }
   return(rates_total);
  }