MATLAB三维图像坐标轴调整

[v1,v2]=meshgrid(0:5:150,0:5:150);
ta=2;
t1=0.3;
t12=0.5;
t21=0.2;
t22=0.2;
p=0.95;
sm=2.4;
sc=0;
s=(ta+t1+t12+t21+t22./2).*v1./3.6+(v1.^2-v2.^2)./254./p+sm+sc;
surf(s)
为什么图像的V1和V2坐标不是0-150