SUBROUTINE KWCVTC(TRACKW, TRACKC)
 
C  >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
C    Takes a helix expressed in W form and converts it into C form.
C
C  TRACKW   real array (read)
C           W track parameters (Px, Py, Pz, E, X, Y, Z, pt, p, Q)
C
C *TRACKC   real array (write)
C           C track parameters (cu, fi0, da, ct, z0, cos(fi0), sin(fi0), P, Q)
C  >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>