[Ifeffit] Logical range for Amplitude Reduction Factor in EXAFS fitting results

Dear All, I noticed that some published works have reported extremely large values for the amplitude reduction factor. This seems a bit unusual, as the amplitude reduction factor is typically expected to be in the range of 0 to 1. I am curious to know what could be the reasons behind it to get such large values for the amplitude reduction factor during EXAFS fitting. Thank you in advance for your insights. Esmael