Requesting Histogram Data
EClient.reqHistogramData (
requestId: int, id of the request
contract: Contract, Contract object that is subject of query.
useRth: bool, Data from regular trading hours (1), or all available hours (0).
period: String, string value of requested date range. This will be tied to the same bar size strings as the [historical bar sizes](/tws-api/doc/market-data-historical/historical-bars/historical-bar-sizes)
)
Returns data histogram of specified contract.