diff --git a/heliosmatics.html b/heliosmatics.html
index f0772c6..b6ec2a4 100644
--- a/heliosmatics.html
+++ b/heliosmatics.html
@@ -203,6 +203,15 @@
  </tr>
 </table>
 
+<table>
+<tr>
+  <td style="text-align:right" > Recoil radius, inner [mm]:</td> 
+  <td><Input type="text"  style="width:40px" value="10" id='innerRecoil' enterkeyhint="done"/></td>
+  <td style="text-align:right" > outter [mm]:</td> 
+  <td><Input type="text"  style="width:40px" value="45" id='outterRecoil' enterkeyhint="done"/></td>
+</tr>
+</table>
+
 <p></p>
 
 
diff --git a/heliosmatics.js b/heliosmatics.js
index f9e052b..1b1f543 100644
--- a/heliosmatics.js
+++ b/heliosmatics.js
@@ -767,17 +767,20 @@ document.getElementById('posArrayRange').oninput = function(){
 function AdjustRecoilPos(){
   let pos1 = parseInt(document.getElementById('posRecoil').value);
   let pos2 = pos1+10;
-  
+
+  let radius1 = parseInt(document.getElementById('innerRecoil').value);
+  let radius2 = parseInt(document.getElementById('outterRecoil').value);
+
   //document.getElementById('n0').innerHTML = pos1;
-  
+
   let shapeRecoil = {
     type: 'rect', 
       xref: 'x', 
       yref: 'y', 
       x0 : pos1, 
       x1 : pos2, 
-      y0 : 10,
-      y1 : 45,
+      y0 : radius1,
+      y1 : radius2,
       fillcolor : '#FF0000',
       opacity : 0.4,
       line : { width : 0} 
@@ -821,6 +824,22 @@ document.getElementById('posRecoilRange').oninput = function(){
   AdjustRecoilPos();
 }
 
+document.getElementById('innerRecoil').addEventListener('keypress',
+  function(e){
+    if(e.keyCode == 13){
+      AdjustRecoilPos();
+    }
+  }, false
+);
+
+document.getElementById('outterRecoil').addEventListener('keypress',
+  function(e){
+    if(e.keyCode == 13){
+      AdjustRecoilPos();
+    }
+  }, false
+);
+
 function AdjustRangeRZ(){
   
   let zmin = parseInt(document.getElementById('zRange1').value);