+ /**
+ * Get the surveyed plane corresponding to the backside of FMD2.
+ * The plane is done as a best fit of the plane equation to at least
+ * 4 of the available survey points.
+ *
+ * @param rot Rotation matrix (direction cosines)
+ * @param trans Translation vector.
+ *
+ * @return @c true on success, @c false otherwise
+ */
+ Bool_t GetFMD2Plane(Double_t* rot, Double_t* trans) const;
+ /**
+ * Get the factor to translate current coordinates to the canonical
+ * unit (centi-meters).
+ *
+ * @return Conversion factor
+ */
+ Double_t GetUnitFactor() const;
+ /**
+ * Get the coordinates of a survey point (if available).
+ *
+ * @param name Name of the survey point.
+ * @param p Coordinates.
+ * @param e Error on the measurement.
+ *
+ * @return @c true if the survey data is available, @c false otherwise.
+ */
+ Bool_t GetPoint(const char* name, TVector3& p, TVector3& e) const;
+ /**
+ * Calculate the plane translation and rotation from 3 survey points
+ *
+ * @param a 1st Survey point
+ * @param b 2nd Survey point
+ * @param c 3rd Survey point
+ * @param trans Translation vector
+ * @param rot Rotation matrix (direction cosines)
+ *
+ * @return
+ */
+ Bool_t CalculatePlane(const TVector3& a,
+ const TVector3& b,
+ const TVector3& c,
+ Double_t depth,
+ Double_t* trans,
+ Double_t* rot) const;
+ /**
+ * Calculate the plane rotation and translation by doing a fit of
+ * the plane equation to the surveyed points. At least 4 points
+ * must be passed in the @a points array with corresponding errors
+ * in the array @a errors. The arrays are assumed to contain
+ * TVector3 objects.
+ *
+ * @param points Array surveyed positions
+ * @param errors Array of errors corresponding to @a points
+ * @param depth Survey targets depth (perpendicular to the plane)
+ * @param trans On return, translation of the plane
+ * @param rot On return, rotation (direction cosines) of the plane
+ *
+ * @return @c true on success, @c false otherwise
+ */
+ Bool_t FitPlane(const TObjArray& points,
+ const TObjArray& errors,
+ Double_t depth,
+ Double_t* trans,
+ Double_t* rot) const;
+ /**
+ * Create a delta transform from a global rotation matrix and
+ * translation.
+ *
+ * @param global Global matrix of element to transform.
+ * @param rot Rotation matrix (direction cosines)
+ * @param trans Translation
+ * @param delta On return, the delta transform
+ *
+ * @return Newly
+ */
+ Bool_t MakeDelta(TGeoMatrix* global,
+ Double_t* rot,
+ Double_t* trans,
+ TGeoHMatrix& delta) const;
+ /**
+ * Create a delta transform from a global rotation matrix and
+ * translation.
+ *
+ * @param path Path of element to transform.
+ * @param rot Rotation matrix (direction cosines)
+ * @param trans Translation
+ * @param delta On return, the delta transform
+ *
+ * @return Newly
+ */
+ Bool_t MakeDelta(const char* path,
+ Double_t* rot,
+ Double_t* trans,
+ TGeoHMatrix& delta) const;
+ /**
+ * Service member function to print a vector
+ *
+ * @param text Prefix text
+ * @param v Vector (array of 3 doubles)
+ */