Figure 1

Figure : 2 BT4 before bt b NR15 preT NR15 M6 BT7 preT BT7 before bt BT7 after bt BT7 postT NR19 preT NR19 M4 NR19 postT BT4 preT BT4 after bt BT4 postT a NR15 postT NR18 preT R10 preT NR18 M5 NR18 postT BT1 preT BT1 after bt BT1 postT BT2 before bt BT2 after bt BT2 postT NR17 preT NR17 M6 NR17 M11 NR17 postT BT6 preT BT5 preT BT5 postT BT5 after bt BT3 preT BT3 before bt BT3 after bt BT3 postT R11 preT BT6 after bt BT6 postT NR16 preT NR16 M4 NR16 postT BT8 preT BT8 before bt BT8 after bt BT8 postT BT9 preT BT9 before bt BT9 after bt BT9 postT R14 preT R13 preT 3a R12 preT BT2 preT

BT8 preT BT8 before bt BT8 after bt BT8 postT BT5 preT BT5 after bt BT5 postT NR15 preT NR15 M6 NR15 postT BT6 after bt BT6 postT NR17 preT NR17 M6 NR17 M11 NR17 postT NR16 preT NR16 M4 NR16 M12 NR16 postT NR19 preT NR19 M4 NR19 postT BT7 postT BT7 after bt BT2 postT R10 preT NR18 preT NR18 M5 NR18 postT BT1 preT BT2 preT BT1 after bt BT1 postT BT4 preT BT4 before bt (M5) BT4 before bt (M8) BT4 after bt BT4 postT R11 preT R11 W4 BT6 before bt (1) BT6 before bt (2) BT7 preT BT3 preT BT3 after bt BT3 before bt BT3 postT BT6 preT R12 preT (1) R12 preT (2) BT9 before bt R14 preT R13 preT BT9 preT BT9 after bt BT9 postT b 1a 1b 3a Figure 3