Is asymmetric term on y-axis in zero field muSR data usually negative?

16 June 2024 0 3K Report

I am analyzing the zero field muSR data using kubo-Toyabe function. The fit is not converging. I am noted that the asymmetry term on y-axis is neative beyond certain time. I think this is the reason for non convergence. I want to know whether it is correct? I am attaching the image for your reference.

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