Yoiur data are gridded. You only need to reshape your vectors to get the matrices necessary for any contour or 3D plots you want:
[D,S] = xlsread('Book1.xlsx');
[Ux,Ix] = unique(D(:,1));
dIx = diff(Ix);
Xr = reshape(D(:,1), dIx(1), );
Yr = reshape(D(:,2), dIx(1), );
Zr = reshape(D(:,3), dIx(1), );
See the documentation on the contourf (link) function for details.
Experiment to get the result you want.