diff --git a/interface/PoissonSolver3DCylindricalGPU.cxx b/interface/PoissonSolver3DCylindricalGPU.cxx
index 1a9e833..09749d8 100644
--- a/interface/PoissonSolver3DCylindricalGPU.cxx
+++ b/interface/PoissonSolver3DCylindricalGPU.cxx
@@ -1,4 +1,3 @@
-
 /**************************************************************************
  * Copyright(c) 2018,							  *	
  * Kelompok penelitian komputasi berkinerja tinggi			  *
@@ -30,9 +29,9 @@
 #include <math.h>
 #include "PoissonSolver3DCylindricalGPU.h"
 
-const float PoissonSolver3DCylindricalGPU::fgkZ0 = 249.7;     ///< nominal gating grid position
-const float PoissonSolver3DCylindricalGPU::fgkIFCRadius = 83.5;     ///< radius which renders the "18 rod manifold" best -> compare calc. of Jim Thomas
-const float PoissonSolver3DCylindricalGPU::fgkOFCRadius = 254.5;     ///< Mean Radius of the Outer Field Cage (252.55 min, 256.45 max) (cm)
+const float PoissonSolver3DCylindricalGPU::fgkZ0 = 249.7;     ///< panjang  z
+const float PoissonSolver3DCylindricalGPU::fgkIFCRadius = 83.5;     ///< radius dalam
+const float PoissonSolver3DCylindricalGPU::fgkOFCRadius = 254.5;     ///<  radius luar
 
 float PoissonSolver3DCylindricalGPU::fgExactErr = 1e-4;
 float PoissonSolver3DCylindricalGPU::fgConvergenceError = 1e-3;