MQL4 Reference 
Standard constants Indicator lines
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Indicator line identifiers used in iMACD(), iRVI()
and iStochastic() indicators.
It can be one of the following values:
| Constant | Value | Description |
|---|
| MODE_MAIN | 0 | Base indicator line. |
| MODE_SIGNAL | 1 | Signal line. |
Indicator line identifiers used in iADX() indicator.
| Constant | Value | Description |
|---|
| MODE_MAIN | 0 | Base indicator line. |
| MODE_PLUSDI | 1 | +DI indicator line. |
| MODE_MINUSDI | 2 | -DI indicator line. |
Indicator line identifiers used in iBands(),
iEnvelopes(), iEnvelopesOnArray(), iFractals()
and iGator() indicators.
| Constant | Value | Description |
|---|
| MODE_UPPER | 1 | Upper line. |
| MODE_LOWER | 2 | Lower line. |
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