## 6 Conclusions and Future Research
\begin{table}
\begin{tabular}{l c c c c c c c c c} \hline \hline
**City** & **BT(0.7; 0.4)** & **BT(0.6; 0.3)** & **BT(0.6; 0.4)** & **BT(0.6; 0.5)** & **BT(0.7; 0.3)** & **BT(0.7; 0.5)** & **BT(0.8; 0.3)** & **BT(0.8; 0.4)** & **BT(0.8; 0.5)** \\ \hline Heraklion & 0.511 & 0.463 & 0.484 & 0.503 & 0.491 & 0.530 & 0.520 & 0.540 & 0.560 \\ \hline Istanbul & 0.514 & 0.468 & 0.487 & 0.505 & 0.496 & 0.532 & 0.525 & 0.544 & 0.562 \\ \hline Kosice & 0.577 & 0.526 & 0.542 & 0.558 & 0.561 & 0.593 & 0.600 & 0.616 & 0.633 \\ \hline Kraków & 0.576 & 0.527 & 0.541 & 0.555 & 0.562 & 0.589 & 0.599 & 0.613 & 0.628 \\ \hline Lefkosia & 0.570 & 0.522 & 0.537 & 0.552 & 0.555 & 0.584 & 0.589 & 0.605 & 0.620 \\ \hline Leipzig & 0.638 & 0.591 & 0.600 & 0.609 & 0.629 & 0.646 & 0.671 & 0.680 & 0.689 \\ \hline Liege & 0.593 & 0.545 & 0.557 & 0.568 & 0.582 & 0.604 & 0.622 & 0.633 & 0.645 \\ \hline Lille & 0.609 & 0.561 & 0.572 & 0.582 & 0.599 & 0.620 & 0.640 & 0.651 & 0.662 \\ \hline Lisboa & 0.560 & 0.506 & 0.524 & 0.540 & 0.543 & 0.576 & 0.585 & 0.602 & 0.618 \\ \hline Ljubljana & 0.647 & 0.600 & 0.610 & 0.619 & 0.637 & 0.656 & 0.679 & 0.689 & 0.698 \\ \hline London & 0.612 & 0.564 & 0.577 & 0.590 & 0.598 & 0.625 & 0.636 & 0.650 & 0.663 \\ \hline Luxembourg & 0.686 & 0.644 & 0.649 & 0.655 & 0.681 & 0.692 & 0.723 & 0.728 & 0.733 \\ \hline Madrid & 0.549 & 0.500 & 0.517 & 0.534 & 0.532 & 0.566 & 0.566 & 0.583 & 0.600 \\ \hline Malaga & 0.591 & 0.543 & 0.557 & 0.570 & 0.577 & 0.605 & 0.615 & 0.629 & 0.643 \\ \hline Malmö & 0.643 & 0.596 & 0.604 & 0.613 & 0.634 & 0.651 & 0.677 & 0.686 & 0.694 \\ \hline Manchester & 0.618 & 0.570 & 0.582 & 0.594 & 0.606 & 0.630 & 0.646 & 0.659 & 0.671 \\ \hline Marseille & 0.542 & 0.495 & 0.512 & 0.528 & 0.525 & 0.559 & 0.558 & 0.575 & 0.592 \\ \hline Miskolc & 0.561 & 0.510 & 0.528 & 0.545 & 0.543 & 0.578 & 0.579 & 0.597 & 0.614 \\ \hline München & 0.684 & 0.642 & 0.649 & 0.656 & 0.677 & 0.691 & 0.716 & 0.723 & 0.730 \\ \hline Napoli & 0.449 & 0.401 & 0.428 & 0.453 & 0.423 & 0.475 & 0.445 & 0.472 & 0.498 \\ \hline Oslo & 0.654 & 0.608 & 0.615 & 0.623 & 0.646 & 0.661 & 0.689 & 0.697 & 0.704 \\ \hline Ostrava & 0.607 & 0.561 & 0.572 & 0.583 & 0.596 & 0.618 & 0.634 & 0.645 & 0.657 \\ \hline Oulu & 0.630 & 0.580 & 0.588 & 0.596 & 0.622 & 0.638 & 0.670 & 0.678 & 0.686 \\ \hline Oviedo & 0.625 & 0.577 & 0.586 & 0.595 & 0.616 & 0.634 & 0.660 & 0.669 & 0.678 \\ \hline Palermo & 0.443 & 0.396 & 0.425 & 0.451 & 0.414 & 0.470 & 0.433 & 0.462 & 0.489 \\ \hline Paris & 0.568 & 0.521 & 0.537 & 0.552 & 0.552 & 0.583 & 0.585 & 0.601 & 0.617 \\ \hline Piatra Neamt & 0.602 & 0.553 & 0.565 & 0.577 & 0.590 & 0.614 & 0.632 & 0.644 & 0.656 \\ \hline Podgorica & 0.536 & 0.488 & 0.506 & 0.524 & 0.517 & 0.554 & 0.549 & 0.568 & 0.586 \\ \hline Praha & 0.621 & 0.574 & 0.584 & 0.594 & 0.611 & 0.631 & 0.651 & 0.662 & 0.672 \\ \hline Rennes & 0.656 & 0.610 & 0.616 & 0.623 & 0.649 & 0.662 & 0.694 & 0.700 & 0.707 \\ \hline Reykjavik & 0.641 & 0.595 & 0.604 & 0.614 & 0.631 & 0.651 & 0.672 & 0.682 & 0.692 \\ \hline Riga & 0.592 & 0.540 & 0.553 & 0.566 & 0.579 & 0.605 & 0.624 & 0.637 & 0.649 \\ \hline Roma & 0.486 & 0.438 & 0.460 & 0.482 & 0.464 & 0.508 & 0.492 & 0.514 & 0.536 \\ \hline Rostock & 0.637 & 0.590 & 0.600 & 0.609 & 0.628 & 0.646 & 0.670 & 0.680 & 0.689 \\ \hline Rotterdam & 0.637 & 0.591 & 0.600 & 0.608 & 0.628 & 0.646 & 0.669 & 0.678 & 0.688 \\ \hline Skopje & 0.438 & 0.396 & 0.417 & 0.437 & 0.417 & 0.458 & 0.439 & 0.460 & 0.480 \\ \hline Sofia & 0.543 & 0.492 & 0.513 & 0.533 & 0.522 & 0.562 & 0.554 & 0.575 & 0.595 \\ \hline Stockholm & 0.631 & 0.583 & 0.593 & 0.602 & 0.622 & 0.640 & 0.665 & 0.675 & 0.684 \\ \hline Strasbourg & 0.638 & 0.592 & 0.600 & 0.608 & 0.630 & 0.646 & 0.672 & 0.680 & 0.689 \\ \hline Tallimn & 0.624 & 0.574 & 0.585 & 0.595 & 0.614 & 0.634 & 0.658 & 0.669 & 0.679 \\ \hline Tirana & 0.415 & 0.379 & 0.393 & 0.406 & 0.402 & 0.429 & 0.425 & 0.439 & 0.452 \\ \hline Torino & 0.567 & 0.518 & 0.534 & 0.549 & 0.552 & 0.583 & 0.588 & 0.604 & 0.620 \\ \hline Tyneside conurbation & 0.644 & 0.597 & 0.607 & 0.616 & 0.635 & 0.653 &