<p><b>A.</b> Physical properties. Pixel values are approximate. Differences between male and female faces used here can be noted. Male faces enlarge more with smiling, and have smaller eyes but bigger teeth. Both male and female faces get wider with smaller eyes when smiling. <b>B.</b> Emotional properties from a validation study in adults [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0129812#pone.0129812.ref030" target="_blank">30</a>]. All stimuli adequately conveyed the desired emotion. Differences between sets were greater than differences between male and female faces within each set. Hit rates, intensity, and arousal ratings are typical of neutral and smiling faces [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0129812#pone.0129812.ref030" target="_blank">30</a>].</p> <p>(XLSX)</p>