Index: trunk/MagicSoft/Mars/mreport/MReportStarguider.cc
===================================================================
--- trunk/MagicSoft/Mars/mreport/MReportStarguider.cc	(revision 7188)
+++ trunk/MagicSoft/Mars/mreport/MReportStarguider.cc	(revision 7196)
@@ -127,4 +127,19 @@
 }
 
+Double_t MReportStarguider::GetDevAbs() const
+{
+    const Double_t pzd = fNominalZd * TMath::DegToRad();
+    const Double_t azd = fDevZd/60  * TMath::DegToRad();
+    const Double_t aaz = fDevAz/60  * TMath::DegToRad();
+
+    const double el = TMath::Pi()/2-pzd;
+
+    const double dphi2 = aaz/2.;
+    const double cos2  = cos(dphi2)*cos(dphi2);
+    const double sin2  = sin(dphi2)*sin(dphi2);
+    const double d     = cos(azd)*cos2 - cos(2*el)*sin2;
+
+    return acos(d)*TMath::RadToDeg()*60;
+}
 
 void MReportStarguider::Print(Option_t *o) const