Contourf line setting number

How can I get only one number on each line and set the font and size of number on the line ?

Answer 1

[KSSV]

[c,h] = contourf(peaks(100)) ;
clabel(c,h,'LabelSpacing',500,'FontSize',15,'Color','red')

Try to put more label spacing, so that you can get the label only once.

[wenhao yang]

thanks for your answer. However, what if I want to get only one number 2 and 4 on the line ?

[wenhao yang]

thank you so much