How can show 2D plot of 3 file data analysis and show effect of change ?

i want to show effect of noise in 3 different data analysis .txt How i can show that like the image below?

Answer 1

[Walter Roberson]

S = fileread('ST1.txt');
S = regexprep(S, '\*I', '');
S(1:100)

ans = 
    '1 1 0.+0.
     1 2 0.+0.
     1 3 0.+0.
     1 4 0.+0.
     1 5 0.+0.
     1 6 0.-0.
     1 7 0.-0.
     1 8 0.-0.
     1 9 0.-0.
     1'

ST1data = cell2mat(textscan(S, '%f %f %f%f'));
ST1 = reshape(ST1data(:,3)+ST1data(:,4)*1i, 101, 101).';
surf(real(ST1)); title('real')

surf(imag(ST1)); title('imag')

●

surf(abs(ST1)); title('abs')

In summary: NO, that data does not look anything like those plots, and you can't get there from here.