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Most Expert Advisors use one or more indicators. MetaTrader platform delivers a set of build‑in indicators and additionally a possibility to write own indicators (Custom Indicators). Unfortunately, a lot of indicators that can be found in the Internet can’t be used by Expert Advisors, because for example they are badly implemented or they only draw objects and can’t be used in a standard way. The other common reason for disqualifying an indicator is the usage of data taken from the future in calculations (not only current and past candles).