diff --git a/src/include/IterationData.h b/src/include/IterationData.h
index 8b8dca9e98afeda9201b92a7b10c1478f747046f..bf38b033096cfd0329dd53ddf075a2f70f36ec26 100644
--- a/src/include/IterationData.h
+++ b/src/include/IterationData.h
@@ -374,6 +374,22 @@ protected:
   double *vec_zpv;
   
 public:
+  //! \brief Cosine of incident radiation azimuth.
+  double cost;
+  //! \brief Sine of incident radiation azimuth.
+  double sint;
+  //! \brief Cosine of incident radiation elevation.
+  double cosp;
+  //! \brief Sine of incident radiation elevation.
+  double sinp;
+  //! \brief Cosine of scattered radiation azimuth.
+  double costs;
+  //! \brief Sine of scattered radiation azimuth.
+  double sints;
+  //! \brief Cosine of scattered radiation elevation.
+  double cosps;
+  //! \brief Sine of scattered radiation elevation.
+  double sinps;
   //! \brief Vacuum magnitude of wave vector.
   double vk;
   //! \brief Wave number.