Dephased shots still belong to the count budget, but they no longer interfere coherently in the phase-sensitive signal. The coherent/dephased split is exact only for the stated counts and binary classification; real measurements add partial coherence, threshold choices, drift, noise subtraction, and readout uncertainty.
The dephased part is counted but does not contribute to the visible phase signal. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Coherent and dephased shots split the budget
Out of 60 phase-sensitive shots, 45 remain coherent and 15 are dephased.
45+15=60
The dephased part stops contributing to visibility
Only the coherent fraction 3/4 contributes to the visible phase signal.