What is the original time interval for AFL code using multiple time frames?

The 2 links below made references to the original time interval.
https://www.amibroker.com/guide/afl/timeframeset.html
https://www.amibroker.com/guide/h_timeframe.html

What is the original time interval in the context of writing AFL code that handle multiple time frames? Is it the base time interval configured in File->database settings? Or is it daily by default?

When it is mentioned switching/getting "back to original interval" then original selected chart interval of toolbar or set periodicity of analysis settings are meant. The compressed interval of timeframe functions has to be a multiple of that original interval. You can not switch to 1minute from selected (original) hourly chart interval, for example. But you can switch to 2hour, 3hour 4hour,..., daily (->24h) etc.

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