backbone 0.375 delay 0.005 backbone 0.35 delay 0.005 backbone 0.325 delay 0.005 backbone 0.3 delay 0.005 backbone 0.275 delay 0.005 backbone 0.25 delay 0.005 backbone 0.225 delay 0.005 backbone 0.2 delay 0.005 backbone 0.175 delay 0.005 backbone 0.15 delay 0.005 backbone 0.125 delay 0.005 backbone 0.1 delay 0.005 backbone 0.075 delay 0.005 backbone 0.05 delay 0.005 backbone 0.025 delay 0.005 backbone off