No. Sorry again for my lack of clarity. I was told that each (x, y) pair is s/t that the system has recorded as a positive id, e.g. it represents a 'thing' that has been recorded as having been observed.
in reply to Re^3: structuring data: aka walk first, grok later
in thread structuring data: aka walk first, grok later
But due to the nature of the instrument, some or many of these may be spurious: "streaks" on the detector, for example. Such things will show up as a "pileup" of points within a given window (so many pixels wide) in x or y.