A four-row dilution scan ties every threshold cycle to a PCR source row. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Four twofold standards stay in one checked ladder
The starts are 96,48,24,12. The fixed threshold is 96, so each halving moves the first crossing one cycle later.
96,48,24,12
The threshold cycles form a one-step staircase
The checked threshold cycles are 0,1,2,3. The first row starts at the threshold, so its cycle is 0.
0,1,2,3
The staircase is not an independent table
Starts 96 and 12 cite counts 96 and 96 at their crossing cycles.