How does the relative scaling of the inputs affect the computation? For instance if one supplies spgr, an early echo and late echo spin-echo set of inputs, are they equally weighted or weighted by their native magnitude? Can one specify the weighting of the inputs? Is a separate bias field estimated for each of the inputs? Thanks, Dolf ____________________ Adolf Pfefferbaum,MD Neuroscience Program SRI International 650-859-2927 phone 650-859-2743 FAX CONFIDENTIALITY NOTICE: Information contained in this message and any attachments is intended only for the adressee(s). If you believe that you have received this message in error, please notify the sender immediately by return electronic mail, and please delete it without further review, disclosure, or copying.