plt.style.use('default')
 
ax = pitch_pos.plot(
    x='Mean pitch (Hz)',
    y='Pitch stdev(Hz)',
    xlabel='Durchschnittliche Grundfrequenz (Hz)',
    ylabel='Standardabweichung Grundfrequenz (Hz)', 
    kind='scatter',
    c='Maximum pitch (Hz)',
    colormap='viridis')
 
ax.figure.savefig("figures/pitch_mean-over-stdv.png", dpi=300)