Index: trunk/Ohana/src/opihi/include/astro.h
===================================================================
--- trunk/Ohana/src/opihi/include/astro.h	(revision 39585)
+++ trunk/Ohana/src/opihi/include/astro.h	(revision 39610)
@@ -20,6 +20,10 @@
   double *dX;
   double *dY;
-  double *Wx;
-  double *Wy;
+  double *Wx; // modified weight based on distance from fit
+  double *Wy; // modified weight based on distance from fit
+  double *Qx; // raw error-based weight (1/dX^2)
+  double *Qy;
+  double *qx; // modified error-based weight (1/dX^2) * Wx
+  double *qy;
   int *index;
   int Npts;
@@ -59,5 +63,5 @@
 
 int FitPMonly_IRLS (PlxFit *fit, double *X, double *dX, double *Y, double *dY, double *T, int Npts, double binning_step, int VERBOSE);
-int FitPMandPar_IRLS (PlxFit *fit, double *X, double *dX, double *Y, double *dY, double *T, double *pR, double *pD, double *Wx, double *Wy, int Npts, int max_iterations, double outlier_limit, double binning_step, int VERBOSE);
+int FitPMandPar_IRLS (PlxFit *fit, double *X, double *dX, double *Y, double *dY, double *T, double *pR, double *pD, double *Wx, double *Wy, double *Qx, double *Qy, double *qx, double *qy, int Npts, int max_iterations, double outlier_limit, double binning_step, int VERBOSE);
 
 int weighted_LS_PLX (double *T, double *pR, double *pD, double *X, double *WX, double *Y, double *WY, int Npts, double **A, double **B, int VERBOSE);