StsPhysics: Add getter for landau table.

core/detectors/sts/CbmStsPhysics.cxx

@@ -188,6 +188,30 @@ Double_t CbmStsPhysics::LandauWidth(Double_t mostProbableCharge)
 }
 // -------------------------------------------------------------------------
 
+std::pair<std::vector<double>, double> CbmStsPhysics::GetLandauWidthTable() const
+{
+  std::vector<double> landauTableFlat;
+
+  auto landauEntry = fLandauWidth.begin();
+
+  landauTableFlat.push_back(landauEntry->second);
+
+  auto prevLandauEntry = landauEntry;
+  landauEntry++;
+
+  double stepSize = landauEntry->first - prevLandauEntry->first;
+
+  for (; landauEntry != fLandauWidth.end(); landauEntry++) {
+    LOG_IF(fatal, stepSize != landauEntry->first - prevLandauEntry->first)
+      << "StsLandau table doesn't have fixed step size.";
+
+    landauTableFlat.push_back(landauEntry->second);
+    prevLandauEntry = landauEntry;
+  }
+
+  return std::make_pair(std::move(landauTableFlat), stepSize);
+}
+
 
 // -----    Particle charge for PDG PID   ----------------------------------
 Double_t CbmStsPhysics::ParticleCharge(Int_t pid)

core/detectors/sts/CbmStsPhysics.h

@@ -15,6 +15,8 @@
 #include <RtypesCore.h>  // for Double_t, Int_t, Bool_t
 
 #include <map>  // for map
+#include <utility>
+#include <vector>
 
 /** @class CbmStsPhysics
  ** @brief Auxiliary class for physics processes in Silicon
@@ -88,8 +90,10 @@ public:
      **/
   Double_t LandauWidth(Double_t mostProbableCharge);
 
-  std::map<Double_t, Double_t> GetLandauWidthTable() const { return fLandauWidth; }
-
+  /** @brief Raw values of landau width interpolation table
+   ** @return interpolation table values and step size of table
+   **/
+  std::pair<std::vector<double>, double> GetLandauWidthTable() const;
 
   /** @brief Energy for electron-hole pair creation in silicon
      ** @return Pair creation energy [GeV]