A crosstalk channel moves counts across lanes by an exact declared direction. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

A neighbor channel can move lane a into lane b

Starting from 50 in lane a and 50 in lane b, one fifth from lane a gives 40 and 60.

Nforward=(40,60)\vec N_{\text{forward}}=(40,60)
Forward crosstalkThe lane labels are bound to the channel rows.1/2lane a1/2lane b2/5lane a3/5lane bchannel map

The reverse contrast is a different declared channel

If the moved fifth comes from lane b instead, the output becomes 60 in lane a and 40 in lane b.

Nreverse=(60,40)\vec N_{\text{reverse}}=(60,40)
Reverse crosstalkDirection is structural, not a caption flag.1/2lane a1/2lane b3/5lane a2/5lane bchannel map