+#ifndef ALIHBTMONITORFUNCTION_H
+#define ALIHBTMONITORFUNCTION_H
+//__________________________________________________________________
+////////////////////////////////////////////////////////////////////
+//
+// class AliHBTMonitorFunction
+//
+// class AliHBTMonOneParticleFctn
+// class AliHBTMonTwoParticleFctn
+//
+// class AliHBTMonOneParticleFctn1D
+// class AliHBTMonOneParticleFctn2D
+// class AliHBTMonOneParticleFctn3D
+//
+// class AliHBTMonTwoParticleFctn1D
+// class AliHBTMonTwoParticleFctn2D
+// class AliHBTMonTwoParticleFctn3D
+//
+// Base Classes for monitoring functions
+// author: chajecki@if.pw.edu.pl
+//
+/******************************************************************/
+/*
+Base classes for monitor functions
+
+ monitor function
+ / \
+ / \
+ / \
+ / \
+ / \
+ / \
+ / \
+ one particle two particle
+ / | \ / | \
+ / | \ / | \
+ 1D 2D 3D 1D 2D 3D