contour map on matlab

Hello everybody I have a distribution of 3 dependent data in the form of x,y,z to use in plotting a contour map in matlab. My x values are 6 numbers, y 5 numbers and z is 6*5 as shwon in the form below:

x1y1z11, x2y1z12, x3y1z13, x4y1z14,x5y1z15,x6y1z16;
x1y2z21, x2y2z22, x3y2z23, x4y2z24,x5y2z25,x6y2z26;
x1y3z31, x2y3z32, x3y3z33, x4y3z34,x5y3z35,x6y3z36;
x1y4z41, x2y4z42, x3y4z43, x4y4z44,x5y4z45,x6y4z46;
x1y5z51, x2y5z52, x3y5z53, x4y5z54,x5y5z55,x6y5z56;

I have decided to use the imagesc but my representation of data is not falling in line. I would appreciate it if an advise would be offered in plotting the contour map in the matlab. Thanks a lot in advance.