Table 3.
Distance between PI-hub and PI-hub (unit: km).
| PI-hub number | Pi-hub (1) | Pi-hub (2) | Pi-hub (3) | Pi-hub (4) |
|---|---|---|---|---|
| Pi-hub (1) | – | 1137 | 1224 | 1578 |
| Pi-hub (2) | 1137 | – | 1316 | 1645 |
| Pi-hub (3) | 1224 | 1316 | – | 1221 |
| Pi-hub (4) | 1513 | 1645 | 1221 | – |
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