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[Jan Stránský <honzik.stransky@xxxxxxxxx>]

>
>
>
> When I ask for properties of the interaction like
> O.interactions[0,1].phys.kmn
>
> it gives ;
> AttributeError: 'NoneType' object has no attribute 'kmn'
>

This means that O.interactions[0,1].phys is None and therefore the
interaction is only potential and not real