Dear All, I have a question regarding the registration part in Feat. previously, when my FSL version was 4.1.4, the registration runs smoothly (without warning or error). but, after i installed new version of FSL (4.1.5), i found that the registration for my new subject got some warnings. and then, i just re-run the same subject i have already done to check out if this is because of the subject, but again i got these warnings, quote from the log file: "Setting subsampling Setting reg mode Setting lambda SpMat::SolveForx: Warning requested tolerence not obtained. Requested tolerance was 0.001, and achieved tolerance was 0.851883 This may or may not be a problem in your application, but you should look into it SpMat::SolveForx: Warning requested tolerence not obtained. Requested tolerance was 0.001, and achieved tolerance was 0.160804 This may or may not be a problem in your application, but you should look into it Setting subsampling Setting reg mode Setting lambda Setting subsampling Setting reg mode Setting lambda Setting subsampling Setting reg mode Setting lambda SpMat::SolveForx: Warning requested tolerence not obtained. Requested tolerance was 0.001, and achieved tolerance was 0.3133 This may or may not be a problem in your application, but you should look into it SpMat::SolveForx: Warning requested tolerence not obtained. Requested tolerance was 0.001, and achieved tolerance was 0.0911515 This may or may not be a problem in your application, but you should look into it Setting subsampling Setting reg mode Setting lambda"my question is that, since i am running the same subject with the same design, the only difference is the version of FSL. and i don't see any difference in the registration tab of the log file (i mean the image showed the registration results). so what should i do with these results, is it right? and what should i do if it's not right? thanks in advance. Your E-mail and More On-the-Go. Get Windows Live Hotmail Free. Sign up now. _________________________________________________________________ Hotmail: Trusted email with powerful SPAM protection. https://signup.live.com/signup.aspx?id=60969