At the moment, the FEFLOW GUI does not provide such an option. Accordingly, you have to export the data manually and use an external software (e.g. Excel) to make the scatter plots based on different groups. Alternatively, you could use the FEFLOW API by writing a Python Script, which retrieves the heads calculated at observation points. You can use the API function [font=courier][color=blue] doc.getFlowValueOfObsIdAtCurrentTime(obsID)[/color][/font] to retrieve heads from FEFLOW. If required, other API functions addressing available History Charts stored within a dac-file are also available. After you received the heads, you can generate an arbitrary number of group combinations. Plot corresponding graphs and save them as graphic files using external libraries (e.g. matplotlib).