# Composition of the Order Book ### DOM Composition Structurally, the Order Book is a vertical tape of price levels and set volumes associated with the current limit orders: * The left column displays the volumes of the placed limit orders. * The right column displays the current price levels for the placed orders. ![](/files/lVNsSvNsyxCNvhIUg5PL)![](/files/9XuQwqSJWTYSuHxkrqD9) In the Smart DOM terminal, the Order Book has a composite structure. This fact makes it possible to enable/disable some elements. The Order Book consists of the following components: * The Price Scale displays the current price of the financial instrument according to the placed limit orders. * The Volume Scale displays the volume of orders at each price level. * The Trading Block is located at the right side of the Order Book and shows the order position and active orders. * The PnL widget is located at the bottom of the Order Book and shows the current result for the order position It is necessary to underlined that the relationship between the elements and their combinations affect the resulting configuration and functionality of the Order Book. **1EX Terminal consists:** * *The price scale* displays the price of the instrument according to the placed limit orders * *The volume scale* displays the volume of orders at each price level * *The trading block* is located to the right of the order book and shows the position and active orders * *The PnL widget* is located at the bottom of the order book and shows the current result for the position --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://1ex.gitbook.io/1ex-smart-dom/features/order-book-dom/composition-of-the-order-book.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.