void MakePMDResMisAlignment(){
  // Create TClonesArray of residual misalignment objects for PMD
  //
  // Macro to randomly displace the 4 sectors of the PMD
  // in each plane. Each sector (to be misaligned) 
  // of PMD houses the following :
  // (a) 6 modules of preshower plane
  // (b) 6 modules of veto plane
  // (c) The FEE boards on back plane of each module
  // (d) 6 modules of convertor plates
  // The clustering is done module-wise
  // The actual amount displacement will be provided
  // by the survey data and has to be converted into
  // displacement in x,y,z,theta, phi and psi 
  
  
  // Now specify the path of the module to be misaligned
  // as followed in the PMD geant
  
  /*
     _____________
    |    |        |
    | 1  |   3    |
    |    |________|
    |____|___|    |
    |        | 2  |
    |   4    |    |
    |________|____|
    
    // Misalignment Matrix is expected to be
    // same for sectors 1 and 4 
    // and for the sectors 2 and 3
    // As these will be mounted on the same
    // Steel plate 
 */
  
  const char* macroname = "MakePMDResMisAlignment.C";

  // Activate CDB storage and load geometry from CDB
  AliCDBManager* cdb = AliCDBManager::Instance();
  if(!cdb->IsDefaultStorageSet()) cdb->SetDefaultStorage("local://$ALICE_ROOT/OCDB");
  cdb->SetRun(0);
  
  AliCDBStorage* storage;
  
  if( TString(gSystem->Getenv("TOCDB")) == TString("kTRUE") ){
    TString Storage = gSystem->Getenv("STORAGE");
    if(!Storage.BeginsWith("local://") && !Storage.BeginsWith("alien://")) {
      Error(macroname,"STORAGE variable set to %s is not valid. Exiting\n",Storage.Data());
      return;
    }
    storage = cdb->GetStorage(Storage.Data());
    if(!storage){
      Error(macroname,"Unable to open storage %s\n",Storage.Data());
      return;
    }
    AliCDBPath path("GRP","Geometry","Data");
    AliCDBEntry *entry = storage->Get(path.GetPath(),cdb->GetRun());
    if(!entry) Fatal(macroname,"Could not get the specified CDB entry!");
    entry->SetOwner(0);
    TGeoManager* geom = (TGeoManager*) entry->GetObject();
    AliGeomManager::SetGeometry(geom);
  }else{
    AliGeomManager::LoadGeometry(); //load geom from default CDB storage
  }    

  Float_t max_trans=0.1;
  Float_t max_rot=0.1;

  const char *Sector1="PMD/Sector1"; 
  const char *Sector2="PMD/Sector2";
  const char *Sector3="PMD/Sector3"; 
  const char *Sector4="PMD/Sector4"; 
  
  
  //Sectors 1 and 4
  Double_t dx14, dy14, dz14;          // Misalignment in X,Y and Z
  Double_t dpsi14, dtheta14, dphi14; //  Angular displacements
  //Sectors 2 and 3
  Double_t dx23, dy23, dz23;          // Misalignment in X,Y and Z
  Double_t dpsi23, dtheta23, dphi23; //  Angular displacements
  
  
  
  // At present give some random shifts
  // generated by random numbers
  // max_trans : Maximun shifts in X,Y,Z  in centimeters
  // max_rot   : Maximum shifts in angles in degrees
  // Double_t max_trans, max_rot;
  
  
  TRandom *rnd   = new TRandom(4357);
  
  // For sectors 1 and 4
  // Translation displacement
  dx14     = (rnd->Uniform()-0.5)*max_trans;
  dy14     = (rnd->Uniform()-0.5)*max_trans;
  dz14     = (rnd->Uniform()-0.5)*max_trans;
  //Rotation angles
  dpsi14   = (rnd->Uniform()-0.5)*max_rot;
  dtheta14 = (rnd->Uniform()-0.5)*max_rot;
  dphi14   = (rnd->Uniform()-0.5)*max_rot;
  
  // For sectors 2 and 3
  // Translation displacement
  dx23     = (rnd->Uniform()-0.5)*max_trans;
  dy23     = (rnd->Uniform()-0.5)*max_trans;
  dz23     = (rnd->Uniform()-0.5)*max_trans;
  //Rotation angles
  dpsi23   = (rnd->Uniform()-0.5)*max_rot;
  dtheta23 = (rnd->Uniform()-0.5)*max_rot;
  dphi23   = (rnd->Uniform()-0.5)*max_rot;
  
  
  //Create a TClonesArray of Align Object to store displacement Angles
  TClonesArray *array = new TClonesArray("AliAlignObjParams",10);
  TClonesArray &alobj = *array;
  
  Int_t iIndex=0; //  let all modules have index=0 in a layer with no LUT
  AliGeomManager::ELayerID iLayer = AliGeomManager::kInvalidLayer;
  UShort_t volid = AliGeomManager::LayerToVolUID(iLayer,iIndex);

  new(alobj[0]) AliAlignObjParams(Sector1, volid, dx14, dy14, dz14, dpsi14, dtheta14, dphi14, kFALSE);
  new(alobj[1]) AliAlignObjParams(Sector2, volid, dx14, dy14, dz14, dpsi14, dtheta14, dphi14, kFALSE);
  new(alobj[2]) AliAlignObjParams(Sector3, volid, dx23, dy23, dz23, dpsi23, dtheta23, dphi23, kFALSE);
  new(alobj[3]) AliAlignObjParams(Sector4, volid, dx23, dy23, dz23, dpsi23, dtheta23, dphi23, kFALSE);
  
  if( TString(gSystem->Getenv("TOCDB")) != TString("kTRUE") ){
    // Create a File to store the alignment data
    const char* filename = "PMDresidualMisalignment.root";
    TFile f(filename,"RECREATE");
    if(!f){
      Error(macroname,"cannot open file for output\n");
      return;
    }
    Info(macroname,"Saving alignment objects to the file %s", filename);
    f.cd();
    f.WriteObject(array,"PMDAlignObjs","kSingleKey");
    f.Close();
  }else{
  // save in CDB storage
    AliCDBMetaData* md = new AliCDBMetaData();
    md->SetResponsible("");
    md->SetComment("Residual misalignment for PMD, produced with sigmatr=0.1 and sigmarot=0.1 in the local RS");
    md->SetAliRootVersion(gSystem->Getenv("ARVERSION"));
    AliCDBId id("PMD/Align/Data",0,AliCDBRunRange::Infinity());
    storage->Put(array,id,md);
  }
  array->Delete();

}