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haversine_distance_dec(double lat1, double lon1, double lat2, double lon2)

void
median_center(opts)
  HV* opts;

  PREINIT:
    double lat = 0.0f;
    double lon = 0.0f;

  PPCODE:
    if (median_center(opts, &lat, &lon))
      XSRETURN_EMPTY;
      
    mXPUSHs(newSVnv( lat ));
    mXPUSHs(newSVnv( lon ));