请牛大帮忙修改ATR指标,使其能显示3条线

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 //+------------------------------------------------------------------+
 //|                                        ATR.mq4 |
 //|                Copyright ?2005, metaQuotes Software Corp. |
 //|                           http://www.metaquotes.net/ |
 //+------------------------------------------------------------------+
 #property copyright Copyright ?2005, metaQuotes Software Corp.
 #property link      http://www.metaquotes.net/
 
 #property indicator_separate_window
 #property indicator_buffers 1
 #property indicator_color1 DodgerBlue
 //---- input parameters
 extern int AtrPeriod=14;
 //---- buffers
 double AtrBuffer[];
 double TempBuffer[];
 //+------------------------------------------------------------------+
 //| Custom indicator initialization function                  |
 //+------------------------------------------------------------------+
 int init()
    {
   string short_name;
 //---- 1 additional buffer used for counting.
   IndicatorBuffers(2);
 //---- indicator line
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,AtrBuffer);
   SetIndexBuffer(1,TempBuffer);
 //---- name for DataWindow and indicator subwindow label
   short_name= ATR( +AtrPeriod+ )
   IndicatorShortName(short_name);
   SetIndexLabel(0,short_name);
 //----
   SetIndexDrawBegin(0,AtrPeriod);
 //----
   return(0);
    }
 //+------------------------------------------------------------------+
 //| Average True Range                               |
 //+------------------------------------------------------------------+
 int start()
    {
   int i,counted_bars=IndicatorCounted();
 //----
   if(Bars
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