this is the formula used in VirtualJets
I simply copy paste exactly as coded to avoid  any regression

v.

On 31 Oct, 2013, at 10:58 AM, ianna <notifications@github.com> wrote:

> In Geometry/CaloGeometry/interface/CaloCellGeometry.h:
> 
> > @@ -116,11 +117,22 @@ class CaloCellGeometry
> >  
> >    CaloCellGeometry( void );
> >  
> > +  // MUST be called by children constructors
> > +  void initSpan() const {
> 
> @VinInn - I'm not sure the order of corners is defined consistently for different Calo cells (e.g. Ecal vs Hcal, front-back face, etc.). Would it matter for dEta calculation?
> 
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