Use StarVMC/StarBASE to make plots (1D,2D) of radiation lengths per volume

preliminary check for the parameters with which the geantinos are thrown.
The eta and phi bin, as well as the # of geantinos per bin can be changed.

1) Default parameters.
Geantinos are thrown according :

const Float_t eta_min = -6.0;     // min pseudorapidity
const Float_t eta_max = +6.0;     // max pseudorapidity
const Float_t deta    = .1;       // size of etabin
const Float_t phi_min = -180.000; // min phi (in degrees)
const Float_t phi_max = +180.000; // max phi (in degrees)
const Float_t dphi    = 1;        // size of phibin (in degrees)
const Float_t nsample = 4.0;      // number of tracks / bin

• left : total radiation length per phi bin (with an eta bin = 0.1)
• middle : # of geantinos per phi bin (with an eta bin = 0.1)
• rigth : ratio left/middle

Explanation of the Y-axis
setup is now 

const Float_t eta_min = -6.0;     // min pseudorapidity
const Float_t eta_max = +6.0;     // max pseudorapidity
const Float_t deta    = 3;       // size of etabin
const Float_t phi_min = -180.000; // min phi (in degrees)
const Float_t phi_max = +180.000; // max phi (in degrees)
const Float_t dphi    = 1;        // size of phibin (in degrees)
const Float_t nsample = 4.0;      // number of tracks / bin

Fig 3 : deta=3, dphi=1

The number of entries makes sense : 4 (bin eta * range eta) * 360 (bin phi * range phi) *4 (# of geantinos) = 5760

Going back to the initial setup : 
Fig 4 : deta=0.1 , dphi =1