The multiplet splitting in Co and other first row transition metals is complex, and there's a complex array of Auger peaks as well, and often the background underneath 2p core levels can't be easily removed with a simple Shirley or Tougaard model. This all means quantification and the application of well-known peak models can be difficult. I would suggest that your measured ratio of 0.26 is within error of the reported 0.2, and that you can't realistically use your measured 0.26 ratio to infer anything else other than the results suggest low spin Co(II) as compared to literature.

Thanks Dr. Ben F. Spencer . It will help me a lot. One thing to add, this is a Co(II) high spin complex. So, I think it will be better not to conclude anything from this ratio. Some of the other high spin complexes, we get the value about 0.33 which are also quite lower.