Observation wells

My observation wells have proper co-ordinates and all required features are present in the .dat file but still, I'm unable to add the observation points. Can someone help me with this.. Could you please tell what all data is required in the .dat file.  

Hi Lydia, what is exactly the problem with the observation points import? Can you be more specific? I would strongly recommend to look and download the Introductory Tutorial. There we demonstrate the insertion of observation points in multiple FEFLOW slices. Carlos

Thank you Carlos. The actual issue is that when I'm trying to add the observation data in the form of ASCII files, the model doesn't accept it, whereas if I add is as an excel file, I'm able to assign. I have a problem in this method as well. When I run the model, I'm unable to see the points plotted on the scatter plot though the model accepts the observation points. I just followed the same steps done on the tutorial. Also what is it about parameter and confidence interval. I have no idea about what it needs to be for my study area.