[Rivet] [Fastjet] Problem with JADE plugin?

[Gavin Salam]

Hi Andy,

>> You can also try exclusive_ymerge_max (but I don't think it'll make much
>> difference -- I'm not sure which corresponds to what Jade did).
>
> I tried that -- at least for the 2->3 inclusive plot it made no
> difference to use the _max version of exclusive_ymerge. For the other
> transitions I got segfaults -- I guess that when using the ymerge_max(n)
> I need to explicitly make sure that n jets can definitely be found in
> the event?

That sounds bizarre. We've got protection in there for such cases, in 
which case you should just get zero. Can you provide a simple example that 
triggers the problem?

Cheers,
Gavin