Suppose Libet knows that your readiness potential peaked at millisecond 6, 810 of the experimental trial, and the clock dot was straight down ( which is what you reported you saw ) at millisecond 7, 005.

Suppose Libet knows that your readiness potential peaked at second 6, 810 of the experimental trial, and the clock dot was straight down ( which is what you reported you saw ) at millisecond 7, 005.

0.003 seconds.