minor

src/main/java/org/orekit/rugged/api/Rugged.java

@@ -369,6 +369,7 @@ public class Rugged {
 
             // compute atmosphere deviation.
             AtmosphericRefraction atmosphericRefraction = new MultiLayerModel();
+            // result.getZenith()
             long deviation = atmosphericRefraction.getDeviation(pBody, lBody, result.getAltitude());
 
         }

src/main/java/org/orekit/rugged/atmosphericrefraction/MultiLayerModel.java

@@ -2,6 +2,9 @@ package org.orekit.rugged.atmosphericrefraction;
 
 import org.apache.commons.math3.geometry.euclidean.threed.Vector3D;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Multi layer model for atmospheric refraction.
  * @author Sergio Esteves
@@ -11,12 +14,15 @@ public class MultiLayerModel implements AtmosphericRefraction {
     private static final double KARMA_LINE = 1000000;
     private static final double LAYER_SIZE = KARMA_LINE * 0.25;
 
+    private List<Double> refractions = new ArrayList<Double>();
+
     private int numberOfLayers = 1;
 
     public MultiLayerModel() {
     }
 
     public MultiLayerModel(int numberOfLayers) {
+        refractions.add(1.00029);
         this.numberOfLayers = numberOfLayers;
     }