static const Int_t NofUnitLayers = 25; // number of detector units
static const Int_t NofDetLayers = 2 * NofUnitLayers; // number of detector layers
static const Int_t NofSegs = 4; // number of detector segments
static const Int_t NofStrips = 19; // number of readout strips in one unit
static const Int_t NofCells = 6; // number of gas cells in one layer
static const Double_t StripWidth = 2.5; // strip width in cm
static const Double_t AnGapWidth = 0.15; // anode gap width in cm
static const Double_t SegGapWidth = 5.0; // segment gap width in cm
static const Double_t DetH = (NofStrips * StripWidth + (NofStrips - 1) * AnGapWidth); // height of detector (x)
static const Double_t LayerH = NofSegs * (DetH + SegGapWidth); // height of layer (x)
static const Double_t DetW = 200.0; // width of detector (y) in cm
static const Double_t St1T = 0.2; // cm
static const Double_t Gas1T = 0.32; // cm
static const Double_t Myl1T = 0.09;  // cm
static const Double_t Myl2T = 0.04; // cm
static const Double_t GlassT = 0.10; // cm
static const Double_t Gas2T = 0.03; // cm
static const Double_t St2T = 0.4; // cm
static const Double_t DetT = 2* ( St1T + Myl1T + (NofCells/2) * (GlassT + Gas2T) + GlassT + Myl2T) + Gas1T + St2T;
static const Double_t UnitT = 2* DetT;