merlyn, tye and tilly (in CB): thanks a lot. tye especially thanks for the warm welcome ;-). Your debug-lines clear up a lot, I must say.

This whole thread is a nice example of a testing procedure gone that evokes it's own problems. My real-world data will, by definition, never repeat. Accidently, some datapoints may have an exact interval of one second, but that chance will be neglectable. (1 out of 1000 or less, I estimate)

I will be on guard for the floating point arrhythmic from now on.

Jeroen
"We are not alone"(FZ)