- changes according to pull request - added description of calculations
- changes according to pull request
- added description of calculations

StongeEtienne/dipy,matthieudumont/dipy,villalonreina/dipy,nilgoyyou/dipy,matthieudumont/dipy,JohnGriffiths/dipy,FrancoisRheaultUS/dipy,StongeEtienne/dipy,nilgoyyou/dipy,JohnGriffiths/dipy,villalonreina/dipy,FrancoisRheaultUS/dipy