Here's the paper: https://academic.oup.com/mnras/article/531/1/366/7671518 https://academic.oup.com/mnras/article/531/1/366/7671518 X-ray astronomers, how weir

Here's the paper: https://academic.oup.com/mnras/article/531/1/366/7671518 https://academic.oup.com/mnras/article/531/1/366/7671518 X-ray astronomers, how weird is it that they show their fits in physical space and not in instrument space?