diff --git a/lib/graph3d/Graph3d.js b/lib/graph3d/Graph3d.js
index 6511c2fb..1612bae9 100644
--- a/lib/graph3d/Graph3d.js
+++ b/lib/graph3d/Graph3d.js
@@ -39,7 +39,9 @@ var OPTIONKEYS = [
   'animationPreload',
   'animationAutoStart',
   'axisColor',
-  'gridColor'
+  'gridColor',
+  'xCenter',
+  'yCenter'
 ];
 
 
@@ -78,7 +80,9 @@ var DEFAULTS = {
   animationInterval: 1000,      // milliseconds
   animationPreload : false,
   axisColor        : '#4D4D4D',
-  gridColor        : '#D3D3D3'
+  gridColor        : '#D3D3D3',
+  xCenter          : '55%',
+  yCenter          : '50%'
 
 
   // Following not in defaults (yet) but present in user settings
@@ -174,9 +178,6 @@ function Graph3d(container, data, options) {
   // These require special attention in some way
   // TODO: handle these
 
-  this.defaultXCenter = '55%';
-  this.defaultYCenter = '50%';
-
   this.showLegend  = undefined; // auto by default (based on graph style)
 
   this.style = Graph3d.STYLE.DOT;
@@ -345,8 +346,8 @@ Graph3d.prototype._convertTranslationToScreen = function(translation) {
   // shift and scale the point to the center of the screen
   // use the width of the graph to scale both horizontally and vertically.
   return new Point2d(
-    this.xcenter + bx * this.frame.canvas.clientWidth,
-    this.ycenter - by * this.frame.canvas.clientWidth);
+    this.currentXCenter + bx * this.frame.canvas.clientWidth,
+    this.currentYCenter - by * this.frame.canvas.clientWidth);
 };
 
 
@@ -873,30 +874,30 @@ Graph3d.prototype.animationStop = function() {
 
 
 /**
- * Resize the center position based on the current values in this.defaultXCenter
- * and this.defaultYCenter (which are strings with a percentage or a value
- * in pixels). The center positions are the variables this.xCenter
- * and this.yCenter
+ * Resize the center position based on the current values in this.xCenter
+ * and this.yCenter (which are strings with a percentage or a value
+ * in pixels). The center positions are the variables this.currentXCenter
+ * and this.currentYCenter
  */
 Graph3d.prototype._resizeCenter = function() {
   // calculate the horizontal center position
-  if (this.defaultXCenter.charAt(this.defaultXCenter.length-1) === '%') {
-    this.xcenter =
-      parseFloat(this.defaultXCenter) / 100 *
+  if (this.xCenter.charAt(this.xCenter.length-1) === '%') {
+    this.currentXCenter =
+      parseFloat(this.xCenter) / 100 *
         this.frame.canvas.clientWidth;
   }
   else {
-    this.xcenter = parseFloat(this.defaultXCenter); // supposed to be in px
+    this.currentXCenter = parseFloat(this.xCenter); // supposed to be in px
   }
 
   // calculate the vertical center position
-  if (this.defaultYCenter.charAt(this.defaultYCenter.length-1) === '%') {
-    this.ycenter =
-      parseFloat(this.defaultYCenter) / 100 *
+  if (this.yCenter.charAt(this.yCenter.length-1) === '%') {
+    this.currentYCenter =
+      parseFloat(this.yCenter) / 100 *
         (this.frame.canvas.clientHeight - this.frame.filter.clientHeight);
   }
   else {
-    this.ycenter = parseFloat(this.defaultYCenter); // supposed to be in px
+    this.currentYCenter = parseFloat(this.yCenter); // supposed to be in px
   }
 };
 
@@ -995,8 +996,6 @@ Graph3d.prototype.setOptions = function (options) {
     safeCopy(options, this, OPTIONKEYS);
 
     // Handle the rest of the parameters
-    if (options.xCenter !== undefined)          this.defaultXCenter = options.xCenter;
-    if (options.yCenter !== undefined)          this.defaultYCenter = options.yCenter;
     if (options.showLegend  !== undefined)      this.defaultShowLegend = options.showLegend; 
 
     if (options.style !== undefined) {