FIGURE 5.

Level in dB of Volume velocity transfer functions $V_g^l$ for all voice qualities according to the legends in all sub-figures, for all vowels, and pitch values ((A) vowel /aː/ A♭4, (B) /iː/ A♭4, (C) /aː/ A♭3). Black vertical lines indicate the nominal fundamental frequencies f _o and the second harmonic 2 ⋅ f _o , respectively. Red vertical lines indicate the range for the fundamental frequency values and the second harmonics audibly produced by the participant during MRI measurements. Because of the highly reproduced vocal exercise, red lines cannot be resolved in the figures and emerge a red area.