diff --git a/work/week11/particle-trajectory-optimization/starting_point/compute_gravity.hh b/work/week11/particle-trajectory-optimization/starting_point/compute_gravity.hh
index a75f2e1..cbdd001 100644
--- a/work/week11/particle-trajectory-optimization/starting_point/compute_gravity.hh
+++ b/work/week11/particle-trajectory-optimization/starting_point/compute_gravity.hh
@@ -1,27 +1,28 @@
 #ifndef __COMPUTE_GRAVITY__HH__
 #define __COMPUTE_GRAVITY__HH__
 
 /* -------------------------------------------------------------------------- */
 #include "compute_interaction.hh"
 
 //! Compute Newton gravity interaction
 class ComputeGravity : public ComputeInteraction {
 
   // Virtual implementation
 public:
   //! Newton gravity implementation
   void computePairInteraction(Particle& par1, Particle& par2) override;
 
   // Accessors
 public:
   //! set the gravitational constant
   void setG(Real G);
 
   // Members
 private:
   //! newton constant
-  Real G = 1.4881e-34;
-};
+
+  Real G = 8.8872e-10;
+
 
 /* -------------------------------------------------------------------------- */
 #endif  //__COMPUTE_GRAVITY__HH__
diff --git a/work/week11/particle-trajectory-optimization/step--0000.csv b/work/week11/particle-trajectory-optimization/step--0000.csv
new file mode 100644
index 0000000..ff0d8e6
--- /dev/null
+++ b/work/week11/particle-trajectory-optimization/step--0000.csv
@@ -0,0 +1,10 @@
+#X Y Z VX VY VZ FX FY FZ mass name
+0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 333060.401628 sun 
+-0.189870191687 -0.558688766307 -0.0282098980491 0.0466061119752 -0.0169958959322 -0.00566593768503 0.0 0.0 0.0 0.0552929494875 mercury 
+16.9714518993 -24.8089038611 0.119716118505 0.00257205257072 0.00179126750251 -9.61511264412e-05 0.0 0.0 0.0 17.1511623039 neptune 
+4.20279027308 2.98574348839 -0.106330648529 -0.0043814893185 0.00639310069043 7.16196974762e-05 0.0 0.0 0.0 317.906831497 jupiter 
+13.5722133861 -13.5968199989 -0.226678332174 0.00280195484701 0.00264110724035 -2.6528604208e-05 0.0 0.0 0.0 14.5357063322 uranus 
+1.4341161723 -0.0563475576814 -0.0364281159082 0.00106980614619 0.0149353365963 0.000286587232631 0.0 0.0 0.0 0.107473137995 mars 
+0.151328208644 -0.971618143147 -0.0 0.0172821497979 0.00271241361076 0.0 0.0 0.0 0.0 1.0 earth 
+-0.717631580513 -0.00364737734108 0.0413723125562 -1.5802845881e-05 -0.0203358469254 -0.000276996812978 0.0 0.0 0.0 0.815044397449 venus 
+6.407518055 7.01488406549 -0.377432769674 -0.0043424142317 0.00367836321207 0.000108694950481 0.0 0.0 0.0 95.1845135537 saturn