Column 1 gives the number of 1:1 links in the detection ground truth and in the computed segmentation result. Detection FN make up the difference between the numbers. Column 2: Safe Subset of NN gives the number of potential NN links forward from ground truth or detected cells that pass the safe distance test (equation 1). Links that pass are subdivided into correct and incorrect categories. Column 3 gives the number of potential NN links that pass all 3 tests (equations 1, 2, 3) also broken down into correct and incorrect links.