Gnuplot: x squared minimization method

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To create a contour plot of parameters A and B using gnuplot, based on the x squared minimization method, you need to plot the values where the difference between x^2 and the minimum value x^2_(minimum) equals 1σ (2.3). The data should be organized in a .dat file with four columns: A, B, x^2, and Xx^2_(minimum), where X^2_(minimum) is a constant. The contour plot will visually represent the regions where the function's value is within the specified range, allowing for analysis of the parameter space defined by A and B. Additional context or specific gnuplot commands may enhance the plotting process, but the essential requirement is the proper formatting of the data file for effective visualization.
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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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