diff -u -r1.7 -r1.8
--- AlignmentUtils.java	28 Sep 2012 22:08:39 -0000	1.7
+++ AlignmentUtils.java	23 Oct 2012 01:52:23 -0000	1.8
@@ -25,7 +25,7 @@

     public void setDebug(boolean debug) {
         _debug = debug;
     }

-    public BasicMatrix calculateLocalHelixDerivatives(HelicalTrackFit trk, HelicalTrackStrip strip, double smax, int _nlc) {

+    public BasicMatrix calculateLocalHelixDerivatives(HelicalTrackFit trk, double xint) {

         
         // Calculate the derivative w.r.t. to the track parameters (in order/index):
         // d0, z0, slope, phi0, R

@@ -39,14 +39,13 @@

         // The return object is a 3-by-5 matrix with the derivatives.
         //
         // Input:

-        double xint = strip.origin().x(); // the position along the beam axis (x-axis) for the strip. 

         double xr = 0.0; // reference position - typically set top PCA i.e. (x0,y0)
         double yr = 0.0; // reference position - typically set top PCA i.e. (x0,y0)
         double d0 = trk.dca();
         double phi0 = trk.phi0();
         double R = trk.R();
         double slope = trk.slope();

-        double s = HelixUtils.PathToXPlane(trk, xint, smax, _nlc).get(0);

+        double s = HelixUtils.PathToXPlane(trk, xint, 0, 0).get(0);

         double phi = -s/R + phi0;
         BasicMatrix dfdq = new BasicMatrix(3,5); //3-dim,ntrackparams