Hi Sebastian, This could be a rounding error. I will have to take a closer look at it and will get back to you asap. Thanks for reporting, Florian PS: Pviz looks nice. Already have a couple of use cases :-) On 02/05/14 21:52, "Sebastian Gibb" <sgibb.debian at gmail.com> wrote: >sTrack <- SequenceTrack(Hsapiens) >