remove unused function

SKIRT/core/Snapshot.cpp

@@ -313,16 +313,6 @@ double Snapshot::velocityDispersion(int m) const
 
 ////////////////////////////////////////////////////////////////////
 
-double Snapshot::velocityDispersion(Position bfr) const
-{
-    thread_local EntityCollection entities;  // can be reused for all queries in a given execution thread
-    getEntities(entities, bfr);
-    return entities.averageValue([this](int m) { return velocityDispersion(m); },
-                                 [this](int m) { return currentMass(m); });
-}
-
-////////////////////////////////////////////////////////////////////
-
 Vec Snapshot::magneticField(int m) const
 {
     const auto& propv = properties(m);

SKIRT/core/Snapshot.hpp

@@ -464,12 +464,6 @@ class Snapshot
         of range, the behavior is undefined. */
     double velocityDispersion(int m) const;
 
-    /** This function returns the velocity dispersion at the
-        specified point \f${\bf{r}}\f$. If the point is outside the domain, the function returns
-        zero dispersion. If the velocity dispersion is not being imported, the behavior is
-        undefined. */
-    double velocityDispersion(Position bfr) const;
-
     /** This function returns true if the magnetic field is being imported, and false otherwise. */
     bool hasMagneticField() const { return _magneticFieldIndex >= 0; }