Diastoli refers to the process when our left atrium fills the left ventricle. And that's when our blood vessel basically relaxes and the ventricle relaxes. And the normal value for that is about 80 Mercury. So the way that we measure pressure is by taking the ratio of the largest to the smallest. So we have contraction, our cystily 120 and relaxation 80. So it's 120 over 80 is the normal blood pressure.