How do I set the recombination rate properly in sim_ancestry?

[NewAtl]

Hi there!

I was using msprime for the last weeks an i wondered:

How can I set the recombination rate in msprime to ensure a specific expected number of recombination events occurs in the entire Ancestral Recombination Graph (ARG)?

Heres what i tried so far:

ts = msprime.sim_ancestry(3,ploidy = 1,population_size = 100, recombination_rate = 0.0667, sequence_length = 30,additional_nodes = msprime.NodeType.RECOMBINANT,coalescing_segments_only = False)

I thought i could calculate the number of expected recombination events (E) like this: E=0.0667×30=2.001.
However, the code above results in over 700 nodes with the flag 131072 which means 350 recombination events right?

Im very happy about some responses since i got quite confused xD Thanks in advance!

Best,
NewAtl