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The same expression logic that is used on Barchart.com is supported in Barchart for Excel:
symbols - must be enclosed in "curly brackets". Examples: {ZC*1} {ESU17} {IBM} {^EURUSD}
constants: any floating point number like 2.35; note that we don't support "scientific" notation (for example 1.72E5)
Operators:
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