The Rows Returned box contains information about the responses from the VSO Data Providers that were queried.
Data Providers may place an limit on the number of records returned in a single query.
This will keep the user from waiting for the results of a search that matched more than was suitable for that Data Provider. (eg, a year's worth of data is suitable for an instrument that has one data product per day, but it could result in an instrument that generates a products at a higher cadence, such as once per minute.)
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