IFF purities

There is a very mild p_t dependence

Integrated over all bins single pion purity is 96%. There is a 4% Kaon contribution and ~0.5% electrons.
That means that the purity for pion pairs is about 92% with the rest  pi+/K- and K+/pi- pairs.

These are for single hadrons:

Purities in M_inv bins

bin nr pion kaon electron
1 95 4 0.5
2 96 3 0.5
3 96 3 0.5
4 96 3 0.5
5 96 4 0.5
purities in p_t bins

bin nr pion kaon electron
1 94 5 0.5
2 95 4 0.4
3 96 3 0.5
4 96 3 0.6
5 97 3 0.5

Looks like 3% between lowest and highest, but is more something like 2, 94.48% vs 96.55.

In eta the PID is relatively constant: 96.3% for eta bin 0 and 3 and 96% for bins 1,2, probably because the tracks are a little bit shorter.

Note to self: to extract numbers relax PID cuts, otherwise fit won't converge