Is the source research for this public or is it (like the full text of the article) also paywalled? Have read the teaser abstract and leading diagrams, and my

Is the source research for this public or is it (like the full text of the article) also paywalled? Have read the teaser abstract and leading diagrams, and my main curiosity is how the groupings break down granularly: e.g. former-USSR & "Western Europe" are both extremely! internally diverse. Given the averages for both, I wouldn't be surprised if some WE countries are even above 8, and if some former-USSR's are lower again. * India, US and China are also internally diverse, but at least are each individual countries.