3.6 m (suitable for sub-line 5 and below) 4.05 m (suitable for sub-line 5 and below) 4.5 m (suitable for sub-line 5 and below) 4.95 m (suitable for sub-line 5 and below) 5.4 m (suitable for sub-line 5 and below) 5.85 m (suitable for sub-line 5 and below) 6.3 m (suitable for sub-line 5 and below) 6.75 m (suitable for sub-line 5 and below) 7.2 m (suitable for sub-line 5 and below)