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Aspen Graphics enables you to reference past bars in a formula. To use data from past bars in a formula, you must identify which bar, or period, you want to use. You include this information in a formula by subscripting (enclosing a positive number in brackets ([n]) one or more instrument constants, variables, or month specifiers. The syntax for subscripting is:
<expression>[integer]
The current bar has a reference value of -1. The previous bar has a reference value of 0, and so on.