-//
-//*-- Author : Yves Schutz (SUBATECH)
-// Modified : Yuri Kharlov (IHEP, Protvino) 15 September 2000
-//
+// Its data members provide geometry parametrization of PPSD
+// which can be changed in the constructor only.
+// Author : Yves Schutz (SUBATECH)
+// Modified : Yuri Kharlov (IHEP, Protvino)
+// 7 November 2000
+