+void AliPosition::SetUnitScale(Float_t s)
+{
+// Set the unit scale for the position coordinates.
+// The scale is normalised w.r.t. the meter, so setting the unit scale
+// to 0.01 means that all position coordinates are in cm.
+// By default the unit scale is set to cm in the AliPosition constructor.
+// It is recommended to use one single unit scale throughout a complete
+// analysis and/or simulation project.
+//
+// Note : This memberfunction does not modify the numerical values of
+// the position coordinates.
+// It only specifies their numerical meaning.
+//
+ if (s>0.)
+ {
+ fScale=s;
+ }
+ else
+ {
+ cout << " *AliPosition::SetUnitScale* Invalid argument s = " << s << endl;
+ }
+}
+///////////////////////////////////////////////////////////////////////////
+Float_t AliPosition::GetUnitScale() const
+{
+// Provide the unit scale for the position coordinates.
+// The scale is normalised w.r.t. the meter, so a unit scale of 0.01
+// means that all position coordinates are in cm.
+ return fScale;
+}
+///////////////////////////////////////////////////////////////////////////
+void AliPosition::SetTimestamp(AliTimestamp& t)
+{
+// Store the timestamp for this position.
+ if (fTstamp) delete fTstamp;
+ fTstamp=new AliTimestamp(t);
+}
+///////////////////////////////////////////////////////////////////////////
+AliTimestamp* AliPosition::GetTimestamp()
+{
+// Provide the timestamp of this position.
+ return fTstamp;
+}
+///////////////////////////////////////////////////////////////////////////
+void AliPosition::RemoveTimestamp()
+{
+// Remove the timestamp from this postion.
+ if (fTstamp)
+ {
+ delete fTstamp;
+ fTstamp=0;
+ }
+}
+///////////////////////////////////////////////////////////////////////////
+void AliPosition::Data(TString f,TString u) const
+{
+// Provide all position/time information within the coordinate frame f.
+//
+// The string argument "u" allows to choose between different angular units
+// in case e.g. a spherical frame is selected.
+// u = "rad" : angles provided in radians
+// "deg" : angles provided in degrees
+//
+// The defaults are f="car" and u="rad".
+
+ Ali3Vector::Data(f,u);
+ if (fTstamp) fTstamp->Date(1);
+}
+///////////////////////////////////////////////////////////////////////////