diff --git a/modules/iswa/rendering/dataplane.cpp b/modules/iswa/rendering/dataplane.cpp
index a68a7b7022..c7f339b0cb 100644
--- a/modules/iswa/rendering/dataplane.cpp
+++ b/modules/iswa/rendering/dataplane.cpp
@@ -79,7 +79,7 @@ DataPlane::DataPlane(const ghoul::Dictionary& dictionary)
         loadTexture();});
     _useLog.onChange([this](){loadTexture();});
     _useHistogram.onChange([this](){loadTexture();});
-    _dataOptions.onChange([this](){loadTexture();});
+    _dataOptions.onChange([this](){ loadTexture();} );
 
 
     _transferFunctionsFile.onChange([this](){
@@ -372,18 +372,18 @@ std::vector<float*> DataPlane::readData(){
             return std::vector<float*>();
         }
         
-        // // FOR TESTING
-        // // ===========
+        // FOR TESTING
+        // ===========
         // std::chrono::time_point<std::chrono::system_clock> start, end;
         // start = std::chrono::system_clock::now();
-        // // ===========
-        
+        // ===========
+
         for(int i=0; i<numSelected; i++){
-            processData(data, selectedOptions[i], optionValues[i], min[i], max[i], sum[i]);
+            processData(data[ selectedOptions[i] ], optionValues[i], min[i], max[i], sum[i]);
         }
         
-        // // FOR TESTING
-        // // ===========
+        // FOR TESTING
+        // ===========
         // end = std::chrono::system_clock::now();
         // _numOfBenchmarks++;
         // std::chrono::duration<double> elapsed_seconds = end-start;
@@ -391,7 +391,7 @@ std::vector<float*> DataPlane::readData(){
         // std::cout << " readData():" << std::endl;
         // std::cout << "avg elapsed time: " << _avgBenchmarkTime << "s\n";
         // std::cout << "num Benchmarks: " << _numOfBenchmarks << "\n";
-        // // ===========
+        // ===========
 
         return data;
         
@@ -403,9 +403,8 @@ std::vector<float*> DataPlane::readData(){
 } 
 
 
-void DataPlane::processData(std::vector<float*> outputData, int inputChannel, std::vector<float> inputData, float min, float max,float sum){
+void DataPlane::processData(float* outputData, std::vector<float>& inputData, float min, float max,float sum){
     
-    float* output = outputData[inputChannel];
     // HISTOGRAM
     // number of levels/bins/values
     const int levels = 512;    
@@ -497,7 +496,7 @@ void DataPlane::processData(std::vector<float*> outputData, int inputChannel, st
         }
         
         v = normalizeWithStandardScore(v, mean, standardDeviation);         
-        output[i] += v;
+        outputData[i] += v;
 
     }
     
diff --git a/modules/iswa/rendering/dataplane.h b/modules/iswa/rendering/dataplane.h
index a1c1b6ce79..565ab511c9 100644
--- a/modules/iswa/rendering/dataplane.h
+++ b/modules/iswa/rendering/dataplane.h
@@ -64,9 +64,8 @@ friend class ISWAGroup;
     void readHeader();
     std::vector<float*> readData();
     void processData(
-        std::vector<float*> outputData, // Where you want your processed data to go 
-        int inputChannel, // index of the data channel
-        std::vector<float> inputData, //data that needs processing 
+        float* outputData, // Where you want your processed data to go 
+        std::vector<float>& inputData, //data that needs processing 
         float min, // min value of the input data
         float max, // max valye of the input data
         float sum // sum of the input data 
@@ -83,7 +82,6 @@ friend class ISWAGroup;
     properties::Vec2Property _backgroundValues;
     properties::BoolProperty _useLog;
     properties::BoolProperty _useHistogram;
-
     
     glm::size3_t _dimensions;
     // std::shared_ptr<ColorBar> _colorbar;