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We are running opt_vbm in spm2 on SPGR images collected from a 1.5T machine. We have a question about the default parameters for bias field correction. Are the values for defaults.bias.reg (0.01) and .cutoff (30) optimal for bias field correction, or should we try different default values for our images? If we should try different values, what range for these defaults should we use? Thank you, Katie Hobbs