Phase loss is a finite coherent/dephased ledger, not an exponential fit. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Phase loss splits coherent from dephased shots

Out of 100 phase-sensitive shots, 60 remain coherent and 40 are dephased.

60+40=10060+40=100
Phase-loss count splitThe coherent and dephased bars close the count.3/5coherent2/5dephasedphase loss

Only the coherent fraction scales visibility

The coherent fraction is 3/5, so an ideal visible count of 50 becomes 30.

5035=3050\cdot\frac{3}{5}=30
Visibility budgetThe phase-loss check recomputes the visible count.3/5coherent2/5dephasedphase loss