Mask for PVC not consistent with oxford_asl

[mcraig-ibme]

While the output seems pretty close the regenerated mask is significantly different. Need to compare OXASL with Flora's updated oxford_asl code to see what is causing this. To my eye the OXASL mask looks better but this may not be the case!

• OXASL
  

• oxford_asl
  

[mcraig-ibme]

Looks like an applywarp vs applyxfm example