Please see the following fitting examples in your Continuity installation directory: 

 * pcty/examples/data01 (A simple 2D 1 layer geometric fitting problem (prolate only)) 
 * pcty/examples/data02 (A simple 2D fiber fitting problem) 
 * pcty/examples/data03 (A complex rabbit geometric fitting problem. Constraints are not set up properly yet.) 
 * pcty/examples/data04 (A 90-element pig mesh) 
 * pcty/examples/data05 (A problem to demonstrate nodal coupling for a geometric fit. Constraints are not set up proplery yet.) 
 * pcty/examples/data06 (A complex geometric fit example) 
  * Starts with 2D mesh 
  * Performs prolate fit 
  * Converts to cartesian 
  * Fits x,y, and z coordinates 
  * Changes to 3D problem 

 * [attachment:FitDT.zip Diffusion tensor fitting files]