Left: comparison of the mean element abundances from the γ Dor sample (black dots) with abundance values for non-pulsating stars from Varenne & Monier (1999; blue squares), Monier (2005; orange triangles), Gebran et al. (2008; green stars), Gebran et al. (2010; red crosses), and K"i"l"i"çoğlu et al. (2016; purple reversed triangles). Right: comparison of the mean element abundances from the SPB sample (black dots) with abundance values for non-pulsating stars from Lyubimkov et al. (2005; purple reversed triangles), Simón-Díaz (2010; red crosses), Nieva & Simón-Díaz (2011; orange triangles), Nieva & Przybilla (2012; green stars), and Lyubimkov et al. (2013; blue squares).