Three channel separations straddle the detector resolution floor. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Resolution compares separation with the floor
Line A is at channel 11 and line B is at channel 13. Their separation is 2 channels against floor 3, so resolved is 0.
∣13−11∣=2<3,resolved=0
Resolution compares separation with the floor
Line A is at channel 11 and line B is at channel 14. Their separation is 3 channels against floor 3, so resolved is 1.
∣14−11∣=3≥3,resolved=1
Resolution compares separation with the floor
Line A is at channel 11 and line B is at channel 15. Their separation is 4 channels against floor 3, so resolved is 1.