Dear,

I was trying to do some linear combination fitting using Athena software. Although the box “All weight between 0 and 1” is ticked I get negative weight results.

I have read the online Athena’s User's Guide, but I did not find what the issue can be. Do you have any ideas?

Below you can find some print screens of my actions. I also get an “error” (print screen 2), which I don’t understand.  

Thanks in advance

Elien