Changes

</math>

</math>

where we take ''n'' coherent amplitudes and allow incoherent sums indexed by

where the PWA sum is over ''n'' coherent amplitudes, and indices &gamma;, &delta; represent the

&gamma;, &delta; to allow for applications like spin-density matrices (&rho;).

spins of the external particles (incoming photon, incoming and outgoing nucleon), with &rho;

representing their collective spin-density matrix.

When amplitude analysis fits contain amplitudes with not free parameters, it is convenient to

When amplitude analysis fits contain amplitudes with not free parameters, it is convenient to

rearrange the summations above, to pre-compute the sum over the intensities of the events:

rearrange the summations above, to pre-compute the sum over the intensities of the events: