A Systems View Across Time and Space
 | ACU | ATT | PEU | PRC | PRR | PRT | PRU | SCI |
---|---|---|---|---|---|---|---|---|
ACU | Â | Â | Â | Â | Â | Â | Â | Â |
ATT | 0.345 | Â | Â | Â | Â | Â | Â | Â |
PEU | 0.580 | 0.555 | Â | Â | Â | Â | Â | Â |
PRC | 0.451 | 0.299 | 0.549 | Â | Â | Â | Â | Â |
PRR | 0.694 | 0.729 | 0.590 | 0.571 | Â | Â | Â | Â |
PRT | 0.508 | 0.614 | 0.832 | 0.539 | 0.578 | Â | Â | Â |
PRU | 0.506 | 0.612 | 0.847 | 0.541 | 0.565 | 1.203 | Â | Â |
SCI | 0.519 | 0.258 | 0.317 | 0.255 | 0.193 | 0.262 | 0.273 | Â |