diff --git a/src/lib/aqdiagram/graph/timegraph.c b/src/lib/aqdiagram/graph/timegraph.c
index 2cc5b0c..93ea4fe 100644
--- a/src/lib/aqdiagram/graph/timegraph.c
+++ b/src/lib/aqdiagram/graph/timegraph.c
@@ -22,6 +22,15 @@
 #include <ctype.h>
 
 
+/* ------------------------------------------------------------------------------------------------
+ * definitions
+ * ------------------------------------------------------------------------------------------------
+ */
+
+#define AQDG_TIMEGRAPH_MARGINSPERCENT_X 1.0
+#define AQDG_TIMEGRAPH_MARGINSPERCENT_Y 10.0
+
+
 
 /* ------------------------------------------------------------------------------------------------
  * forward declarations
@@ -105,14 +114,14 @@ void AQDG_TimeGraph_SetupTicks(AQDG_GRAPH *g, uint32_t flags, double minY, doubl
   /* create ticks for X axis */
   axis=AQDG_Graph_GetAxisByIndex(g, AQDG_GRAPH_AXISPOS_BOTTOM);
   if (axis) {
-    _addMarginsToAxis(axis, 2.0);
+    _addMarginsToAxis(axis, AQDG_TIMEGRAPH_MARGINSPERCENT_X);
     _setupTicksForTimeAxis(axis);
   }
 
   /* create ticks for Y axis */
   axis=AQDG_Graph_GetAxisByIndex(g, AQDG_GRAPH_AXISPOS_LEFT);
   if (axis) {
-    _addMarginsToAxis(axis, 10.0);
+    _addMarginsToAxis(axis, AQDG_TIMEGRAPH_MARGINSPERCENT_Y);
     if (flags & AQDG_TIMEGRAPH_SETUPTICKS_FLAGS_MINY)
       AQDG_Graph_Axis_SetMinValue(axis, minY);
     if (flags & AQDG_TIMEGRAPH_SETUPTICKS_FLAGS_MAXY)