Outliers in the graph can be removed using the remove outlier icon 
in the icon menu of every graph. Each individual series in the graph will be listed and the outliers are removed separately for each of them. The value that is removed from the graph will not be deleted from the GeoMoS database; it is only hidden and can be later added again to the graph.
To remove an outlier click on the remove outlier icon. The new page will open where all the values belonging to this graphs are shown. Select the values you want to remove from graph and store the changes with "Apply" button.
Use the browser back navigation to return to graph or click on the navigation link above the graph which will take you directly back to where the graph originated.