Question about XSENS MTI-G-710 Acceleration Graph

[aseyfi]

Hello,

Thank you very much for making this tool available to public.

I am trying to better understand the results generated by this tool, and noticed in XSENS MTI-G-710 acceleration graph the line with -1/2 slope is fitting to Allan variance graph pretty well, but the line with the slope +1/2 is not fitting at all. Why does this tool insist on fitting a +1/2 line to the graph while the empirical data just doesn't look like a +1/2 line? Is the calculated random walk in this graph really useful?

Thank you very much, Ahmad