Fig. 2. Illustration of the position of the face mask. The mask was moved in the lower lip placement by repositioning the caudal end of the mask above the lower lip while maintaining the head extension. The continuous line  represents the plane between the nose and the mandible. The dashed line  represents the contact achieved between the mask and the face. Only one hand is pictured, and the oropharyngeal airway has been removed to see the position of the mask.