You select a time base, or interval, for the array by toggling the choices in the Interval box in the Link Generator. The Interval box contains six toggles: Tick Intraday (note the Span field, used to supply an intraday time base) Daily Weekly Monthly Quarterly Tick selects data stored trade-by-trade in your TICKS.DAT file. Intraday selects data stored in the BARS15.DAT file. If you choose Intraday, you must provide a time base for the array in the Span field. You can use any span between 1 and 1439. The Daily, Weekly, Monthly and Quarterly selections choose data stored in the DAYS.DAT file.Interval