x=0.7:0.4:6;
y=tanh(x)+59;
plot(x,y, 'o-');
note1=median(y);
note2=mean(y);
line([min(x), max(x)], note1*[1 1], 'color', 'r');
line([min(x), max(x)], note2*[1 1], 'color', 'm');
ylabel('Semitone');
xlabel('Pitch index');
legend('PV', 'Median', 'Mean', 'Location','SouthEast');