diff --git a/databuffer.cpp b/databuffer.cpp
new file mode 100644
index 0000000..280d924
--- /dev/null
+++ b/databuffer.cpp
@@ -0,0 +1,18 @@
+#include "databuffer.h"
+
+DataBuffer::DataBuffer(const nix::DataArray &array) : arrayId(array.id()), minRange(0.0), maxRange(0.0)
+{
+    buffer = new QVector<QPointF>;
+}
+
+DataBuffer::~DataBuffer() {
+    delete buffer;
+}
+
+double DataBuffer::rangeMaximum() {
+    return rangeMax;
+}
+
+void DataBuffer::rangeMaximum(double max) {
+    rangeMax = max;
+}
diff --git a/databuffer.h b/databuffer.h
new file mode 100644
index 0000000..7a14115
--- /dev/null
+++ b/databuffer.h
@@ -0,0 +1,26 @@
+#ifndef DATABUFFER_H
+#define DATABUFFER_H
+
+#include <nix.hpp>
+
+class DataBuffer
+{
+public:
+    DataBuffer(const nix::DataArray &array);
+    ~DataBuffer();
+
+private:
+    std::string arrayId;
+    QVector<QPointF> *buffer;
+    double rangeMin, rangeMax;
+
+    double rangeMaximum();
+    void rangeMaximum(double max);
+
+    double rangeMinimum();
+    void rangeMinimum(double min);
+
+
+};
+
+#endif // DATABUFFER_H
diff --git a/multichartview.cpp b/multichartview.cpp
index 1da28db..d7197a8 100644
--- a/multichartview.cpp
+++ b/multichartview.cpp
@@ -101,13 +101,6 @@ ChartView* MultiChartView::createChartView(Chart *chart, const ArrayInfo &info)
     view->setLineWidth(1);
     view->setRenderHint(QPainter::Antialiasing);
 
-    /*
-    QMargins margins = voltageChart->margins();
-    int marg1 = margins.left();
-    margins.setLeft(marg1 * 4);
-    eodChart->setMargins(margins);
-    */
-
     this->viewMap.insert(std::pair<std::string, ChartView*>(info.arrayid, view));
     return view;
 }
@@ -136,8 +129,7 @@ void MultiChartView::newDataRequest(const std::string &entity_id, qreal max) {
 
 void MultiChartView::dataReady(QString requestId){
     // need to make sure, that only one task does the conversion on the same buffer at the same time.
-    std::cerr << "converting data for array: " << requestId.toStdString() << std::endl;
-    DataResult1D data = dataQueue->getData(requestId);
+        DataResult1D data = dataQueue->getData(requestId);
     if (data.id.empty()) {
         return;
     }
@@ -145,7 +137,6 @@ void MultiChartView::dataReady(QString requestId){
 }
 
 void MultiChartView::dataConverted(QString entityId, double ymin, double ymax) {
-    std::cerr << "data converted for: " << entityId.toStdString() << std::endl;
     Chart *chart = chartMap[entityId.toStdString()];
     QLineSeries *series;
     bool newSeries = false;