how to make a 2d contour graph

How to make a 2d colour contour graph. I attached two files.

from the excel file:

x = blue values

y = yellow colour

z = green colour

I tried matlab programme using txt book with same data:

filename = 'a.txt';

A = importdata(filename);

x = A(:,1);

y = A(:,2);

[xx,yy]=meshgrid(x,y);

z=A(:,3);

[zz]=meshgrid(z);

figure

contour(x,y)

[madhan ravi]

contourf(xx,you,zz) % ? Perhaps

[Adam Danz]

or contourf()

https://www.mathworks.com/help/matlab/ref/contourf.html

[madhan ravi]

Agree with Adam , meant contourf() but then typed the other.

[Adam Danz]

contour() is also a possibility, though. Depends if you want fill or not.

https://www.mathworks.com/help/matlab/ref/contour.html

[Amit Kumar]

Thank you so much Madhan and Adam.