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diff --git a/chart2/source/inc/ExponentialRegressionCurveCalculator.hxx b/chart2/source/inc/ExponentialRegressionCurveCalculator.hxx
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+++ b/chart2/source/inc/ExponentialRegressionCurveCalculator.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#ifndef INCLUDED_CHART2_SOURCE_INC_EXPONENTIALREGRESSIONCURVECALCULATOR_HXX
+#define INCLUDED_CHART2_SOURCE_INC_EXPONENTIALREGRESSIONCURVECALCULATOR_HXX
+
+#include "RegressionCurveCalculator.hxx"
+
+namespace chart
+{
+
+class ExponentialRegressionCurveCalculator : public RegressionCurveCalculator
+{
+public:
+    ExponentialRegressionCurveCalculator();
+    virtual ~ExponentialRegressionCurveCalculator() override;
+
+protected:
+    virtual OUString ImplGetRepresentation(
+        const css::uno::Reference<css::util::XNumberFormatter>& xNumFormatter,
+        sal_Int32 nNumberFormatKey, sal_Int32* pFormulaLength = nullptr ) const override;
+
+private:
+    // ____ XRegressionCurveCalculator ____
+    virtual void SAL_CALL recalculateRegression(
+        const css::uno::Sequence<double>& aXValues,
+        const css::uno::Sequence<double>& aYValues ) override;
+
+    virtual double SAL_CALL getCurveValue( double x ) override;
+
+    virtual css::uno::Sequence<css::geometry::RealPoint2D> SAL_CALL getCurveValues(
+        double min,
+        double max,
+        sal_Int32 nPointCount,
+        const css::uno::Reference<css::chart2::XScaling>& xScalingX,
+        const css::uno::Reference<css::chart2::XScaling>& xScalingY,
+        sal_Bool bMaySkipPointsInCalculation ) override;
+
+    // formula is: f(x) = m_fSign * exp(m_fLogIntercept) * exp( m_fLogSlope * x )
+    // mathematical model f(x) = Intercept * Slope^x
+    double m_fLogSlope;
+    double m_fLogIntercept;
+    double m_fSign;
+};
+
+} //  namespace chart
+
+// INCLUDED_CHART2_SOURCE_INC_EXPONENTIALREGRESSIONCURVECALCULATOR_HXX
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */