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[Feature]: Configurable fit window past the nominal pulse period (Leica extended tail) #5

Description

@alex1075

What problem would this solve?

Leica all-photon exports carry real tail photons past the nominal 12.5 ns pulse period (out to ~14 ns; 140+ bins). Leica recommends fitting the extended window, and in testing the extended-window fit gave a lower chi2 than cutting at ~12 ns.

Proposed solution

Let the user fit the full extended time window rather than truncating at the nominal pulse period, with correct handling of the wrap/tail region.

Area

FLIM fitting / IRF handling

Raised during external facility testing, June 2026.

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