Measured detector slots can grow through more repeated frames or a larger checked pixel grid. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Measured slots have pixel and frame factors
A detector stack is not only a pixel grid. The frame count is a second factor, so a reader needs rows for both grid size and repeat frames.
Nslots=r⋅c⋅Nframes
Frame count and pixel count can reach the same scale
The middle row grows by adding frames. The last row grows by adding pixel addresses. Both routes land in the same measured slot scale by exact multiplication.
r335c444Npixel121220Nframe253Nslot246060
The last row closes from pixel count first
The last row has 20 pixel addresses and 3 frames. The measured slot count follows from those two checked factors.