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Hi there, I need to know, when I switch from M5 to M15 on the chart, does it take the last 14 minutes, and place the candlestick in the 15th minute and then work the rest of the chart back accordingly, or where does it get a beginning or end for the

Hello,  I am looking for a way to ensure that my EA is running in a 15 Minute Chart because the tests I want to do is for a 15 minute time frame. I found an example of the ma (ma.mq5) but all the comments are garbled, so if someone can please