I am working on processing diffusion data with Tracula and can't seem to resolve an error I encounter attempting to run the "trac-all -prep -c" command on my data. The error message that I get arises due to the line of code where I specify the echospacing in fieldmap images. It reads that the "flag is not recognized". I am able to run the command smoothly and obtain diffusion metrics when specifying dob0 = 0. I have included my trac-all.log and configuration file for reference. 

Can anyone offer guidance in navigating this issue? It is greatly appreciated! 

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