>Chen-Ming, The paper can be 'got' from here: http://www.fil.ion.ucl.ac.uk/spm/dox.html#Papers It is 'SPM-1'. Best, Dave. ========================= David J McGonigle Biomagnetic Imaging Lab, Box 0628, Dept. of Radiology UCSF, 513 Parnassus Ave San Francisco CA 94143 USA =========================