To remove unwanted data you can use one of two methods:
1. Delete all historic data from the data source. To do this open the data source properties and go to the Historic tab. Then click Delete, it will turn gray. Then click save to delete all data in a data source. Please read the docs for more information: https://docs.eagle.io/en/latest/topics/nodes/location/index.html?highlight=delete#historic
2. Use the in-place data editing tool to delete only select readings you want to remove. PLEASE READ CAREFULLY BEFORE PRECEEDING. To use data editor open any chart that contains the readings you want to remove. Click on the pen and paper icon to toggle data editing. Then with the correct parameter checked off in the chart legend click and drag to highlight the readings you wan to delete. They will turn Yellow, you can then click on the trash can to delete them. If you made a mistake you can click the undo swoosh to undo any changes BUT ONCE YOU CLICK SAVE YOU CANNOT UNDO A DELETE. Please read the docs for more information before preceding; https://docs.eagle.io/en/latest/topics/historic_data/editing/index.html?highlight=edit%20data and see this short video introduction to data editing https://www.youtube.com/watch?v=ZAzPal5o5xk
