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# Introduction

The Topic specifies the tick types returned values after requesting market data. Each cell in Excel will correspond to a given Topic string to represent the given dataset. If no Topic is specified,  "Last" value will be returned by default.

\*\*\*Note:\**If you do not have the corresponding Market Data Subscription, '0' will be displayed if you request for live tick types above. Please refer to [Delayed Tick Types](/excel/rtd/topic/delayed-tick-types) if you are interested in receiving 15-minute delayed data.*