diff --git a/include/cdr.h b/include/cdr.h
new file mode 100644
index 0000000000000000000000000000000000000000..b5d22137833b963ca80a9369fd873a84960518fe
--- /dev/null
+++ b/include/cdr.h
@@ -0,0 +1,49 @@
+/** @file cdr.h
+ *  @brief Header file for cdr grids. */
+
+#include "cstream.h"
+#include "tree.h"
+
+#ifndef _GRID_H_
+#include "grid.h"
+#endif
+
+#ifndef  _RZ_ARRAY_H_
+#include "rz_array.h"
+#endif
+
+#ifndef  _TREE_H_
+#include "tree.h"
+#endif
+
+#ifndef _CDR_H_
+typedef struct cdr_grid_t cdr_grid_t;
+
+struct cdr_grid_t {
+  RECT_COORDS;
+  LEAF_FIELDS(cdr_grid_t);
+  int ext_bound;
+
+  /* Pointer to each of the species. And their time derivatives */
+  rz_array_t **dens;
+  rz_array_t **d_dens;
+
+  /* Components and magnitude of the electric field */
+  rz_array_t *er, *ez, *etheta, *eabs;
+  rz_array_t *charge;
+
+  rz_array_t *photo;
+
+  REAL *max_dens;
+  REAL max_charge;
+  REAL max_eabs;
+
+  int contains_edge;
+};
+
+#define SET_DENS_OVERWRITE 1
+#define SET_DENS_ADD 2
+#define SET_DENS_SUB 3
+
+#define _CDR_H_
+#endif