Detector slot counts become clearer when grid shape and frame count are scanned. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
The first detector row fixes both products
A 4 by 5 detector grid gives 20 addresses. Repeating those addresses over 3 frames gives 60 measured slots.
Naddr=4⋅5=20,Nslots=20⋅3=60
Changing shape and frames changes the slot total
A taller 6 by 2 grid has 12 addresses. With 4 frames, the checked slot count is 48.
Naddr=6⋅2=12,Nslots=12⋅4=48
A third row makes the relation scannable
The final row has 8 by 2 addresses and 2 frames, so the displayed total is 32 measured slots. The three rows show addresses and frames as separate factors.