Address count is a physical grid count before it becomes a biological interpretation. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Chip readout begins with addressable slots
A chip grid has rows and columns before it has a genome-scale interpretation. The middle training grid has 5 rows and 4 columns.
Nslots=rows⋅cols
Three grids separate shape from address count
The address count is multiplication. Scanning grid shape makes it visible that more rows and more columns both matter.
rows456cols345Nslots122030
The largest grid has the most local measurements
The large row has 6 rows and 5 columns, giving 30 addresses. Chemistry or cloning yield is outside this address ledger.