Returns Low price value for the bar of indicated symbol with timeframe and shift.
[in] Symbol name. NULL means the current symbol.
[in] Timeframe. It can be any of ENUM_TIMEFRAMES enumeration values. 0 means the current chart timeframe.
[in] Index of the value taken from the indicator buffer (shift relative to the current bar the given amount of periods ago).
For the current chart, the information about low prices is in the Low predefined array.