Comment on analysis of X-ray diffraction data in the paper 'Structural and size dependence magnetic properties of Mn-doped NiO nanoparticles prepared by wet chemical method' by C. Thangamani et al. [J. Mater. Sci: Mater. Electron. 31, 11101 (2020)]

In the commented paper, there are some questionable data which should be explained or corrected by the Authors, Thangamani et al. In this comment, I have tried to pinpoint incorrect data or inconsistencies and to verify the correctness of the data presented in the crystallographic part of the paper.