Dear FSL expert, I am a new user and use the redhat 7.3 to run FSL. I have a problem when use the example data. The error message is: Starting SIENAX at Fri Aug 2 21:41:10 CTS 2002 /home/usr/fsl/bin/sienax /home/usr/feeds/results/structural -d syntex error in expression "100.0* (1558173.8612181848 /home/usr/fsl/bin/sienax: over" while executing "expr 100*($a-$b)/$denom" (procedure "simpleperror" line 5) involked from within "simpleperror $A $B 1600000" (file :./RUN" line 196 real 37m53.455s user 34m11.340s sys 0m38.190s Can anyone tell me how to correct it ? Sincerely yours Dr. Jung Lung Hsu Department of Neurology SK memorial hospital Taiwan