Three indexed pools keep source balance visible instead of hiding it behind the total.
Three indexed pools keep source balance visible instead of hiding it behind the total. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Three different index patterns keep the same total
The totals are 24, 24, and 24 unique reads, but the per-index rows differ.
8+8+8=246+8+10=24
A wider spread still needs visible source rows
The wide row has reads 4,8,12. It still sums to 24, so the total alone cannot describe balance.
4+8+12=24
The useful scan compares rows before the total
Index A changes from 8 to 6 to 4 while the total stays 24.