Readout acceptance follows exact interval overlap, not a caption. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Positive interval overlap accepts the signal
The signal from 6 to 10 seconds overlaps the window from 4 to 11 seconds by 4 seconds.
Δtoverlap=4
No interval overlap rejects the signal
A signal from 12 to 14 seconds has overlap 0 with the same window.
Δtoverlap=0
Endpoint touch still has zero overlap
A signal starting at 11 seconds only touches the window endpoint. The half-open overlap is 0.