Introduction
Instead of returned data points as a function of time as with the function IBApi::EClient::reqHistoricalData, histograms return data as a function of price level with function IBApi::EClient::reqHistogramData
Instead of returned data points as a function of time as with the function IBApi::EClient::reqHistoricalData, histograms return data as a function of price level with function IBApi::EClient::reqHistogramData