Comment 9 for bug 744236

Concerning the problem of 4 top, I think that the problem is linked to this interactions (and may be some other)

mg5>display interactions 399
Interactions 399 has the following property:
{
    'id': 399,
    'particles': [-2,2,9000063],
    'color': [1 ],
    'lorentz': ['FFS43', 'FFS66'],
    'couplings': {(0, 1): 'GC_296', (0, 0): 'GC_278'},
    'orders': {'QED': 1, 'QCD': 1}
}

while for the color content, I would naivly expect the same behavior as the t t~ h interactions in the sm:
mg5>display interactions 41
Interactions 41 has the following property:
{
    'id': 59,
    'particles': [-6,6,25],
    'color': [1 T(1,0)],
    'lorentz': ['FFS2'],
    'couplings': {(0, 0): 'GC_97'},
    'orders': {'QED': 1}
}

So I would tend to claim that this is a FR problem (since the color is not correctly set).
I will send an email to claude such that, it will be aware of this report and can interact with you,

All the best,

Olivier