Hello!

I'm a Research Associate working in the University of the Philippines Manila.

I'm wondering about the ligand interaction diagram in DS4.0. it's pretty straightforward and easy to generate and interpret. However, I have recently encountered a BLUE circle in the diagram. I have no idea what type of interaction it denotes as it is not in any tutorials I search.

I know this question is pretty simple but I can't search what the blue circle is for.

Hope you can help me. Thanks!!!