A computerized trading system for trading a tradable product at stock exchanges where a user can define a number of criteria to be met in order for the system to allow/indicate a trade order of a selected Symbol or allow/indicate a pair trade of two selected Symbols. A method to format a data stream providing a novel result used for the calculation of technical indicators and the derived criteria and/or used for visual presentation of price movements of the tradable product in the computerized trading system by determining the time to close a bar. Product data having product prices is received at different times by the computer system, and the computer system for each closed bar has corresponding bar data buffers with data representing time of close of bar and last received product price at close of bar.