= GRW collapse-centre event probabilities
{c}
{title2=$p_1(B),\ p_{2\mid1}(B)$}
For equal particle rates in the <GRW model>, the next centre falls in $B$ with probability $N^{-1}\sum_i\int_B\|L_i(c)\Psi\|^2dc$. With zero <Hamiltonian operator>, two successive centres in $B$ have joint probability $N^{-2}\sum_{ij}\int_Bdc\int_Bdd\|L_j(d)L_i(c)\Psi\|^2$. Dividing by the first-event probability gives the conditional second event, including repeated particle labels. Spatial probabilities depend on actual packet mass, not solely the nominal packet centres.
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