Help with choice of contour intervals in surfc

Is it possible to define a non-default contour plot interval in surfc like it is easily achieved in the contour-based range of plots?

For example how might i plot contours over z-intervals [-7:1:8] in the following:

Z = peaks(X,Y);

surfc(X,Y,Z)

colorbar

Answer 1

[Star Strider]

The second object in surfc is the countour plot, so address it and set the 'LevelList' property —

[X,Y,Z] = peaks(50);

figure
hsc = surfc(X,Y,Z)

hsc = 
  2×1 graphics array:

  Surface
  Contour

colormap(turbo(50))
colorbar
hsc(2).LevelList =  -7:8;

.