TRTH intraday summary extraction-

SummmaryInterval is defined in the TickHistoryIntradaySummariesCondition class. The possible values are:

    public enum TickHistorySummaryInterval
    {
        OneSecond = 0,
        FiveSeconds = 1,
        OneMinute = 2,
        FiveMinutes = 3,
        TenMinutes = 4,
        FifteenMinutes = 5,
        OneHour = 6,
    }

The example is available in the C# Example Application at the download section. Please refer to the On Demand Extractions -> Create: TickHistoryIntradaySummaries example.

From my test, if it is not defined, it will return Intraday 1 Sec interval data.