class AliPMDv1: public AliPMD

 Create geometry for Photon Multiplicity Detector

 Creates the geometry of the cells of PMD, places them in  modules
 which are rectangular objects.
 Basic unit is ECAR, a hexagonal cell made of Ar+CO2, which is
 placed inside another hexagonal cell made of Cu (ECCU) with larger
 radius, compared to ECAR. The difference in radius gives the dimension
 of half width of each cell wall.
 These cells are placed in a rectangular strip which are of 2 types
 EST1 and EST2.
 Two types of honeycomb EHC1 & EHC2 are made using strips EST1 & EST2.
 4 types of unit modules are made EUM1 & EUM2 for PRESHOWER Plane and
 EUV1 & EUV2 for VETO Plane which contains  strips placed repeatedly

 These unit moules are then placed inside EPM1, EPM2, EPM3 and EPM4 along
 with lead convertor ELDA & ELDB and Iron Supports EFE1, EFE2, EFE3 and EFE4
  They have 6 unit moudles inside them in each plane. Therefore, total of 48
 unit modules in both the planes (PRESHOWER Plane & VETO Plane). The numbering
 of unit modules is from 0 to 47.

 Steel channels (ECHA & ECHB) are also placed which are used to place the unit modules

 In order to account for the extra material around and on the detector, Girders (EGDR),
 girder's Carriage (EXGD), eight Aluminium boxes (ESV1,2,3,4 & EVV1,2,3,4) along with
 LVDBs (ELVD), cables (ECB1,2,3,4), and ELMBs (ELMB) are being placed in approximations.

  Four FR4 sheets (ECC1,2,3,4) are placed parallel to the PMD on both sides, which perform
 as cooling encloser

 Create final detector from Unit Modules
 -- Author : Bedanga and Viyogi June 2003

 Create materials for the PMD

 ORIGIN    : Y. P. VIYOGI

  cout << " Inside create materials " << endl;

 Initialises PMD detector after it has been built

 Called at each step in the PMD

 This gives all the parameters of the detector
 such as Length of Supermodules, type A, type B,
 thickness of the Supermodule

 Create entries for alignable volumes associating the symbolic volume
 name with the corresponding volume path. Needs to be syncronized with
 eventual changes in the geometry.

 Set the entire CPV plane off

 Set the entire Preshower plane off

 Set the individual module off