Gnuplot: x squared minimization method

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sketos
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Hello,

I am using the x squared minimization method to compute two parametres in a function let's say (A,B) which correspondes to the minimum value of x^2. Now if i want to make a contour plot of A,B (A=x axis and B=y axis) for the values of x^2-x^2_(minimum)=1σ=2.3 what is the proper way using gnuplot?

Supose i have a table(.dat file) with 4 colums with the values of (A,B,x^2,Xx^2_(minimum)) *(X^2_(minimum) is constant)
 
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