RT 1 s RT 1 s with 5 s silence at the beginning RT 10 90 RT 10 s RT 10 s with 5 s silence at the beginning RT 100 ms RT 100ms with 5 s silence at the beginning RT 12 s RT 12 s with 5 s silence at the beginning RT 16 s RT 16 s with 5 s silence at the beginning