+ fFile = fopen(fFileName,"r");
+ Int_t ir = 0;
+
+
+ if (fFile) {
+ printf("\n File %s opened for reading, %p ! \n ", fFileName.Data(), (void*)fFile);
+ } else {
+ printf("\n Opening of file %s failed, %p ! \n ", fFileName.Data(), (void*)fFile);
+ return;
+ }
+
+ if (fNskip > 0) {
+ // Skip the first fNskip events
+ SkipEvents();
+ }
+//
+//
+//
+// Read file with gas pressure values
+ char *name = 0;
+ if (fRunPeriod < 5) {
+ name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/gasPressure.dat" );
+ fGPASize = 21;
+ fG1 = new Float_t[fGPASize];
+ fG2 = new Float_t[fGPASize];
+ fZ1 = new Float_t[fGPASize];
+ fZ2 = new Float_t[fGPASize];
+ } else if (fRunPeriod == 5) {
+ name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/pressure_2003_startup.dat");
+ fGPASize = 18853;
+ fG1 = new Float_t[fGPASize];
+ fZ1 = new Float_t[fGPASize];
+ } else if (fRunPeriod ==6) {
+ name = gSystem->ExpandPathName("$(ALICE_ROOT)/LHC/pressure_2003_conditioned.dat");
+ fGPASize = 12719;
+ fG1 = new Float_t[fGPASize];
+ fZ1 = new Float_t[fGPASize];
+ } else {
+ Fatal("Init()", "No gas pressure file for given run period !");
+ }
+
+
+ FILE* file = 0;
+ if (name) file = fopen(name, "r");
+ if (!file) {
+ AliError("No gas pressure file");
+ return;
+ }
+
+ Float_t z;
+ Int_t i;
+ Float_t p[5];
+
+ const Float_t kCrossSection = 0.094e-28; // m^2
+ const Float_t kFlux = 1.e11 / 25.e-9; // protons/s
+ Float_t pFlux[5] = {0.2, 0.2, 0.3, 0.3, 1.0};
+
+ if (fRunPeriod < 5) {
+//
+// Ring 1
+//
+
+ for (i = 0; i < fGPASize; i++)
+ {
+ ir = fscanf(file, "%f %f %f %f %f %f", &z, &p[0], &p[1], &p[2] , &p[3], &p[4]);
+ if (ir == 0) break;
+
+ fG1[i] = p[fRunPeriod];
+
+ if (i > 0) {
+ fZ1[i] = fZ1[i-1] + z;
+ } else {
+ fZ1[i] = 20.;
+ }
+ }
+//
+// Ring 2
+//
+ for (i = 0; i < fGPASize; i++)
+ {
+ ir = fscanf(file, "%f %f %f %f %f %f", &z, &p[0], &p[1], &p[2] , &p[3], &p[4]);
+ if (ir == 0) break;
+
+ fG2[i] = p[fRunPeriod];
+ if (i > 0) {
+ fZ2[i] = fZ2[i-1] + z;
+ } else {
+ fZ2[i] = 20.;
+ }
+ }
+//
+// Interaction rates
+//
+ for (i = 0; i < fGPASize; i++)
+ {
+ fG1[i] = fG1[i] * kCrossSection * pFlux[fRunPeriod] * kFlux; // 1/m/s
+ fG2[i] = fG2[i] * kCrossSection * pFlux[fRunPeriod] * kFlux; // 1/m/s
+ }
+
+ } else {
+ for (i = 0; i < fGPASize; i++)
+ {
+ ir = fscanf(file, "%f %e %e %e %e %e", &z, &p[0], &p[1], &p[2], &p[3], &p[4]);
+ if (ir == 0) break;
+ z /= 1000.;
+ fG1[i] = p[4] * kCrossSection * kFlux; // 1/m/s
+ // 1/3 of nominal intensity at startup
+ if (fRunPeriod == kLHCPR674Startup) fG1[i] /= 3.;
+ fZ1[i] = z;
+ }
+ }
+
+
+
+
+//
+// Transform into interaction rates
+//
+
+
+
+
+ Float_t sum1 = 0.;
+ Float_t sum2 = 0.;
+
+ for (Int_t iz = 0; iz < 300; iz++) {
+ Float_t zpos = 20. + iz * 1.;
+ zpos *= 100;
+ Float_t wgt1 = GasPressureWeight( zpos);
+ Float_t wgt2 = GasPressureWeight(-zpos);
+ sum1 += wgt1;
+ sum2 += wgt2;
+ }
+ sum1/=250.;
+ sum2/=250.;
+ printf("\n %f %f \n \n", sum1, sum2);
+ delete file;