# DOM Surface DOM Surface panel shows all past and current changes in the order book — placing, modifying orders, and executing trades. ## Additional DOM Surface columns On the right side of the panel, there are three histograms — **Size, Cumulative Size, Order Book Imbalance**. ![Additional DOM Surface columns with Order Book Size, Cumulative size and Order Book Imbalance](/files/-Lt4f9W_4AhMsVD39vge) * **Size (Current Order Book)** This histogram shows the volume of limit orders at each price level. User can visually compare the size of each bar for determining the most strong level. * **Cumulative Size** This histogram displays the sum of sizes of limit orders for each subsequent level. This histogram allows estimating the dominating side of the market. * **Imbalance (Order Book Imbalance)** This histogram shows the percentage of how much the volume of buy orders exceeds the amount of sell orders (and vice versa) for each price level. It measures whether the limit order book is buy or sell heavy. The more the imbalance exceeds one side, the higher the probability of price movement towards the imbalance. In fact, it is a good predictor of price direction. --- # 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://help.quantower.in/analytics-panels/dom-surface.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.