MQL4参考 
标准常量，列举和架构 指标常量 系列数组标识符
Series Array Identifiers
Series array identifier used with ArrayCopySeries(), iHighest() and iLowest() functions. It can be any of the following values:
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MODE_OPEN
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0
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Open price
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MODE_LOW
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1
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Low price
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MODE_HIGH
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2
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High price
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MODE_CLOSE
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3
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Close price
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MODE_VOLUME
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4
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Volume, used in iLowest() and iHighest() functions
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MODE_TIME
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5
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Bar open time, used in ArrayCopySeries() function
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