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The bvals and bvecs files that TRACULA needs are slightly different to those used by FSL, so new files need to be created. The difference is that FSL has data across columns/volume, whereas TRACULA requires rows/volume, so they simply need to be flipped. One way to do this is as follows:

1. Find the bvals file (e.g., V:\LinuxShare\subjects4FSL\CON302\DTI_b0corr\bvals) and open it in Excel
   • Open Excel
   • File => Open (or Ctrl^O)
   • Change type to "All Files"
   • Select bvals, click Open

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• • In the Text Import Wizard

• • • Step 1 choose "Delimited" (click Next)
    • Step 2 check "Space" (click Finish)

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Here is an example of how to do that.

A configuration file is used to define subjects and locations.

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