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| Variable | Definition |
|---|---|
| Pcount | Number of particles detected in an image |
| N | Number of binding events |
| N+ | Accumulated number of binding events since the movie started |
| N- | Accumulated number of unbinding events since the movie started |
| t | Time elasped in the movie |
| tres | Binding residence time (or contact time) of virus to receptors |
| tcutoff | Minimum binding residence time required for a binding event |
| tmovie | Total duration time of the SPT video |
