I am not certain what you want.
Try this —
D = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1044625/Hisfit%20curve.xlsx');
x = D(:,1);
y = D(:,2);
figure
plot(x, y)
grid
title('Original Data')
figure
surf(x, x, y*y.')
title('Surface Plot Of Original Data (Ax MAtrix)')
figure
contourf(x,x,y*y.')
axis('equal')
title('Contour Plot Of Matrix Data')
.
