*
* $Id$
*
* $Log$
* Revision 1.1.1.1  1995/10/24 10:21:56  cernlib
* Geant
*
*
#include "geant321/pilot.h"
*CMZ :  3.21/02 29/03/94  15.41.48  by  S.Giani
*-- Author :
      SUBROUTINE CTERP(X1,X2,X,Y1,Y2,Y)
C       THIS ROUTINE PERFORMS LINEAR INTERPOLATION
      Y=Y2-(X2-X)*(Y2-Y1)/(X2-X1)
      RETURN
      END