1. MetaTrader charts are constructed using the bid price. 

  2. Closing of buy orders: Generated by the bid price. You will see the chart line hitting your SL (Stop Loss).
  3. Closing of sell orders: Generated by the ask price. It is not visible by default. 
    Stop losses of sell orders may occur on prices not seen on the chart. 
  4. The Ask Line can be enabled by right-clicking on the chart, choosing properties and enabling it.

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