{{"gs", "gs"}}
{{"0", "Top"}, {"1", "Gluon"}, {"2", "LightParticle"}}
M[0,0,1,1] -> -2 * 64/9 * gs^4 * _s*_t / (_t - mq2)^2
M[0,1,0,1] -> -2 * 64/9 * gs^4 * _s*_u/(_u - mq2)^2 + 2 * 16 * gs^4 * (_s^2 + _u^2) / (_t - mg2)^2
M[0,2,0,2] -> 2 * 5 * 16/3 * gs^4 * (_s^2 + _u^2) / (_t - mg2)^2
