Distribution of the integrated hyperfine intensity anomalies of the inner (HIA_IS) and outer (HIA_OS) satellite lines. The red (blue) points illustrate positions, where both the HIA_IS and HIA_OS values deviate by more than 3σ (1σ) from unity. Black points denote positions, where either the HIA_IS or the HIA_OS is located within 1σ of unity, while the green points show positions, where both the HIA_IS and HIA_OS are within 1σ of unity. Grey dashed vertical and horizontal lines subdivide the panel into regions with HIA_IS >1 (labelled I for HIA_OS>1 and IV for HIA_OS<1) and HIA_IS<1 (labeled II for HIA_OS>1 and III for HIA_OS<1).