Before revision:  Finally, we investigate how the final auction price reacts to order placement, especially conditional on imbalance improving or worsening events and find a large difference between the opening and closing auctions, emphasizing the role of liquidity and simultaneous trading in the pre-open or open-market order book .
After revision:  Finally, we investigate how the final auction price reacts to order placement, especially conditional on imbalance improving or worsening events ; the indicative price reverts towards the mid price of the regular limit order book but is not especially bound to the spread .