Certain limits of a dataset

I have some data points (lets say a 1000 points), plotted with respect to time.

I wish to find the 99.5 % limit of the data set, which means that i want to find a value, say "x", below which 99.5 % of the values of my data set lie. How do i approach this.

[Chunru]

help prctile

Answer 1

[mir khadim]

@Chunru Thanks, I think it works.