User interface for an electronic trading system for a computer screen

The single FIGURE is a front view of a user interface for an electronic trading system for a computer screen.

The broken line showing of the computer screen is for illustrative purposes only and forms no part of the claimed design.

The ornamental design for a user interface for an electronic trading system for a computer screen, as shown and described.

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	Number	Date	Country
Parent	29229362	May 2005	US
Child	29277249		US