-typedef struct _plotter_t plotter_t;
-typedef struct _plotter_if_t plotter_if_t;
-typedef struct _rect_t rect_t;
-typedef struct _draw_chordal_opts_t draw_chordal_opts_t;
-typedef struct _color_t color_t;
+typedef struct plotter_t plotter_t;
+typedef struct plotter_if_t plotter_if_t;
+typedef struct rect_t rect_t;
+typedef struct draw_chordal_opts_t draw_chordal_opts_t;
+typedef struct color_t color_t;