Vbnetkhio started emailing owners of kits registered under Serbo-Croatian surnames in order to obtain info about their ancestry. He succeeded in geting some new samples with that method, so he updated the existing Serbian averages accordingly. I'm posting this on his behalf:
https://i.ibb.co/qNQX17W/image.png
The regional averages (Serb_Serbia, Serb_B&H, Serb_Croatia) were formed by joining the samples of their respective subregions together with the samples of individuals who have ancestry from two or more subregions within one country. And, to create the general Serbian average, all of them were combined with the results of Serbs who either didn't specify their ancestral location or simply have regionally mixed ancestry. Montenegro doesn't have enough samples to be divded into subregions.